autogenerate trap list [bounty: 6 XTR]

[DreadKnight]

List of traps should be autogenerated from the ability files when building the game.
We had manual list for units before and it was awful to deal with.
Somewhat related to issue #2294, but probably a bit trickier overall.

The list could be generated from traps assets provided we move them to own folder, something like assets/traps and we could even remove unit names from their filenames (provided its not a bad idea, harder to keep track of what's what), though hopefully this will work fine down the line (need to consider having animated sprites or multiple sprites for traps). Remaining stuff sprites from the folder are actually projectiles; guess at some point we'll also have traps that will act as projectiles (move given time), because there are always exceptions to the rules when it comes to AB, total madness...

Alternatively or complementary we could have ability files define the stuff and when building game, we would have a script scanning those files to compile a list.

[DreadKnight]

Seems there's no more need, at least for now, as there's no longer a manually maintained list.
https://github.com/FreezingMoon/AncientBeast/blob/master/src/utility/trap.ts