Fix aspd buffing v1

[nmaligec]

This fix addresses 2 points that still prevent aspd buffs from selecting the correct character.

1. The extremely low but still present chance that a valid character is not chosen at random from the list of units even after 1000 tries. Now an eligible character will always get chosen without even needing to retry.
2. The list used to detect ineligible characters was repurposed from other code. That list is for characters who cannot safely do damage on their own and so should not appear as the only selections on the buy screen. For example on that list is the 'sage' which cannot do damage (until level 3) but would charge faster with an aspd buff. Now a new list has been added to determine which characters should receive an aspd buff. Additionally, the list of non cooldown and non attacking characters have been updated against the current characters in the game.

I'm also pushing an alternate v2 of this fix, that does the same thing but a bit more efficiently. Instead of lookup tables, it uses variables set for each character in the Player:init section. You can decide which approach, if any, you prefer. This also gave me a chance to learn about basic branching in Git, I hope you don't mind.

[nmaligec]

I just noticed that in the code, a level 3 fairy can pick the exact same unit twice! The unit doesn't gain any extra benefit and the second buff is wasted.

The motivation for making this fix came from watching a YouTube run where they were trying a build that forced attack speed buffs to target certain units. Here is the video timestamped 8 seconds before where a max fairy only buffs 1 unit. I originally thought it was because of case 1 (the extremely rare chance that a second unit doesn't get picked after 1000 tries), but now I see this is the most likely cause for what I saw.

The fix (both v1 and v2) handles this issue properly and reliably gives a second eligible unit the buff from a level 3 fairy.