iwd2::guirec: also display skills that are positive just from boni
LUCommon: split out GetAllClasses for iwd2
LUCommon: add remaining iwd2 support to _SetupLevels
LUCommon: unified indentation, -w suggested
UCommon: shorten SetClassResistances
LUCommon: fold AddPlayerStat into its only user
moved SetClassResistances to a new iwd2 file for cg/lu stuff
SetClassResistances: generalise for any table with the same layout
iwd2::cg: use AddResistances also for racial boni

fixes them overriding class boni (cleric of talos) and removes duplication