Chrono clone fix

Fix nil index error in makeParadoxClone

I'm not sure how/why it happened, but while testing the 1.3.2 beta cut
I got a nil index error in makeParadoxClone() while try to index on
getInven("INVEN"). My character did have an inventory, so this seems
strange. Anyway, it makes sense to check whether INVEN exists before
trying to skip it.

Now, the function checks whether INVEN exists before adding it to the
alt_nodes table.

This should be pushed to 1.3.2.

It's probably safer not to change this, on the off chance that we
actually spawn a clone of a dead actor.

I'm not sure how/why it happened, but while testing the 1.3.2 beta cut
I got a nil index error in makeParadoxClone() while try to index on
getInven("INVEN"). My character did have an inventory, so this seems
strange. Anyway, it makes sense to check whether INVEN exists before
trying to skip it.

Now, the function checks whether INVEN exists before adding it to the
alt_nodes table.

Grisly Constitution reduces all weapons proc damage (description update, this has always worked this way)

Fixed Skirmisher's Swift Shot abuse

New tinker tab on the inventory for characters able to use them (like demonologists in Ashes of Urh'Rok)

Instance index v2

Attempt #2 at making the global variables not visible through instances (and now classes, too!), this time via even cleverer tricks.

Fixed cooldown fix

Previously, Contigency allowed bypassing fixed cooldowns and Matrix allowed reducing fixed cooldowns. In the case of Matrix, there was an attempt to filter out fixed cooldowns, but due to a typo they were not being filtered. Contingency did not have a similar condition, which I assume was an oversight.

Now, Contingency and Matrix will filter out talents with fixed_cooldown==true.

I think this could be included in 1.3.2.