Fixed #181 - Reworked the autoleveling routine for randomized recruitment in GBAFE. The previous logic didn't quite calculate the changes correctly when jumping between promoted and unpromoted classes. The new one takes a more logical approach by operating with effective values instead of strictly the character bases.

This does change a little bit for Karel in a specific case. The existing reverse recruitment patch balanced Karel a bit by starting him with 8 HP, 2 STR, and 5 SKL specifically. Given his growths, there's no natural mathematical way of getting this. So instead of coming up with stats for each possible place he could be recruited at, the logic now just ensures that HP, for any character, can never be below 10 HP (this is so they don't die immediately when entering combat). On the flip side, all of the other stats are allowed to start at 0 instead of an arbitrary minimum value.

Also fixed a random issue where FE8 trainees being randomized into a promoted unit's spot would only promote to the tier 1 class instead of a tier 2 class.