(for 1.8) add power vs save description for talents

Currently, power vs save mechanism is not explained in game, and players can only tell which power/save the specific talent is using for debuff/knockback/... by experience or diving into the code.
This merge request add more details in the descriptions of talents, in the form like (Physical Power vs Mental Save).
Some helper functions are also provided in DescHelper.lua.

Besides, some minor bugs have been fixed, most of which are inappropriate power used in complex damage type. 
Higher draconic T1 is worth noting that it contains 5 damage types, each one uses a slightly difference power. This merge request changes that to use physical power & mindpower, whichever is larger.

Note: This merge request changes many files and brings much work for translation. Besides, I currently have no access to dlcs' repo, and the work for dlcs' talents description might need to be done by someone with the access.

See merge request !758

Pulls the actual parsing of a hotkey into an icon out into its own function

Modifies `engines\default\engine\HotkeysIconDisplay.lua` to better support addons. The current call to `display()` draws every hotkey over the course of a nested iteration, which means that if someone wishes to modify this behavior (e.g. have flagged talents use a different border color, or support multiple talent icons to denote different states of a talent), the entire `display()` function must be entirely replaced. This isn't ideal as these modifications are mutually exclusive.

This MR splits the actual parsing of a hotkey into a `displayHotkey()` function (with appropriate arguments) so that addon developers can safely superload the hotkey drawing behavior.

**This MR is save-safe.**

See merge request !691

Fix Purging Trap to check silence immunity.

The silence aspect of the trap will check silence immunity of the target before applying silence.

See merge request !772

Miscs

1. Bring back the fix: The duration of an existing effect will not be reduced by setting a new effect with a shorter duration (controlled by on_merge for some  effects).
2. Living lightning correctly works with Range Amplification Device
3. Stormshield rune's block number and threshold should be an integer
4. Randart bows & slings should not have base damage

See merge request !771

Update Aura of Undeath description

Update Aura of Undeath description to specify that the inherited damage increase is based on your *highest* damage increase.

See merge request !770

Update special ego rules to include all cases of talent_on_X.

Fixes issues such as the one which will result from imbuing the Prismatic Eye onto armor with a talent_on_spell e.g. Black Robe.

See merge request !769

Change the type for the Avatar Distant Sun Unlock Checker to "base/class"

Change the type for the Avatar Distant Sun Unlock Checker hidden talent to "base/class" so it will not prevent a Sun Paladin from entering Zigur who otherwise could.

See merge request !768

Update the on_pre_use for Vault to check for a shield only.

The action only uses the shield, so we don't need to check for sling and ammo as well.

See merge request !767

Fix Call of the Ooze on_pre_use

Update Call of the Ooze on_pre_use to check your number of total summons vs the limit allowed by Mitosis (Call of the Ooze's own limit is still checked in the action), so it can be used if you already have one or more oozes but do not have max summons or the max oozes allowed by mitosis.

See merge request !766

Correct Vim tooltip.

Vim gain is 1 + 50% Wil times creature rank, not 1 + 30% Wil times half creature rank

See merge request !762

Allow Waters of Life to bypass is_heal test

Allow Waters of Life to bypass is_heal test because it prevents poison/disease from hurting you, even if 0 heal mod stops any healing.

See merge request !760

Update Aura of Undeath description to specify that the inherited damage increase is based on your highest damage increase.

Bring back the fix: The duration of an existing effect will not be reduced by setting a new effect with a shorter duration (controlled by on_merge for some  effects). This means that an effect will not be removed if you save against another application of the same effect.
This was not functioning due to a careless code removal.

Update special ego rules to include all cases of talent_on_X. Fixes issues such as the one which will result from imbuing the Prismatic Eye onto armor with a talent_on_spell e.g. Black Robe.

Change the type for the Avatar Distant Sun Unlock Checker to "base/class" so it will not prevent a Sun Paladin from entering Zigur who otherwise could.

Update the on_pre_use for Vault to check for a shield only. The action only uses the shield, so we don't need to check for sling and ammo as well.

Update Call of the Ooze on_pre_use to check your number of total summons vs the limit allowed by Mitosis (Call of the Ooze's own limit is still checked in the action), so it can be used if you already have one or more oozes but do not have max summons or the max oozes allowed by mitosis.

Correct Vim tooltip. (Vim gain is 1 + 50% Wil times creature rank, not 1 + 30% Wil times half creature rank)

Allow Waters of Life to bypass is_heal test because it can also cleanse effects which could possibly reduce your heal mod to 0 (causing the is_heal test to fail).

# Conflicts:
#	game/modules/tome/data/talents/psionic/psi-fighting.lua
#	game/modules/tome/data/talents/techniques/2hweapon.lua
#	game/modules/tome/data/talents/techniques/strength-of-the-berserker.lua

Prevent Heroism lost life bonus from chaining infinitely.



See merge request !757