Check new pc kit values

[lynxlynxlynx]

In bg2 chargen we explicitly set the kit of specialist mages to the baseclass constant of 0x4000 or-ed with the kit index (row index in the kitlist table). NPCs like Edwin on the other hand have it set to the usability value directly (which are famously unique).

In iwd1 and bg1 we do the sane thing and just use usability (though there are only specialist mages kits present):

gemrb/GUIScripts/bg1/GUICG22.py:127: GemRB.SetPlayerStat (MyChar, IE_KIT, Kit)
gemrb/GUIScripts/iwd/CharGen.py:1148: GemRB.SetPlayerStat (MyChar, IE_KIT, Kit)

vs

gemrb/GUIScripts/bg2/GUICG2.py:135: GemRB.SetPlayerStat (MyChar, IE_KIT, KitValue)
gemrb/GUIScripts/bg2/GUICG22.py:233: GemRB.SetPlayerStat (MyChar, IE_KIT, KitValue)

This discrepancy is odd and should be investigated. It's also the reason we have to jump through hoops in Actor::GetSpecialistSaveBonus and gemrb/GUIScripts/GUICommon.py:354. Since this is ancient code, I suspect we erroded the correct behaviour through time and either all kits should just use usability or specialist mages should be handled separately. Some remnants of that are in our magesch.2da handling, which also has a kit (usability) column.

So:

1. Create a few characters in the original, at least a normal mage, a specialist, a gnome mage.
2. Check with NearInfinity or some other tool what the stored values are. Warning, they're in big endian format, so compare to these values instead.
3. Crosscheck with our behaviour
4. Change it as needed
5. Test for discrepancies — eg. is the stats screen displaying the correct kit? (many GUI functions rely on GetKitIndex working correctly)