Small fixes

Fix 1: Improve efficiency of Arcane Combat info

Changed Arcane Combat's description generator to use table.concat, to
avoid making temporary string objects that need garbage collection.

Fix 2: Fix various typos

Changed Arcane Combat's description generator to use table.concat, to
avoid making temporary string objects that need garbage collection.

Simplified support of double shields by enhancing actor:hasShield()

Sometiems, rarely, a special room will appear in the Infinite Dungeon to let you access the Item's Vault (if you have it active and are a donator)

Merge branch 'value_scroller' of http://git.net-core.org/0player/t-engine4 into 0player/t-engine4-value_scroller

Entity resolve

* Allows certain simple resolvers to be resolved immediately when encountered (set .__resolve_instant = true).
This fixes a problem with some nested resolvers not being resolved completely before other resolvers are processed.
(This shows up with steam giant's melee_project.FIRE being incompletely resolved while the equipment resolver is run with gear that modifies this field.)

Allows certain simple resolvers to be resolved immediately when encountered (set .__resolve_instant = true).
This fixes a problem with some nested resolvers not being resolved completely before other resolvers are processed.
(This shows up with steam giant's melee_project.FIRE being incompletely resolved while the equipment resolver is run with gear that modifies this field.)

also most code stolen from separator

Merge branch 'others_work_incorporated' of http://git.net-core.org/0player/t-engine4 into 0player/t-engine4-others_work_incorporated

Misc fixes

* Randbosses get their class inscriptions (allows gunslingers to get steam implants) and get generalized resource boosts.

Weapon tooltips show extra precision for resource costs.

Fixed a bug in tooltips for projectiles in cheat mode.

Dug sandwalls have a tooltip.

Charactersheet: fixed a bug that could cause the equip button to be labeled incorrectly in the equipdoll.
Shield damage correctly reflects no off-hand penalty.

The lightning overload quest only shows up for Maj'Eyal campaign.