Mirror Image despawns a few turns after leaving combat

ok this truth this was a very nasty thing! Many entities subtables that are supposed to have custom metatables did not always have them because :clone* and table.clone do not copy metatables. That was hell to figure out

Effects that should be removed on level change will be removed even if they can't be removed. This requires no further explanation :)

Changed Adept and other such talent changes to bit a bit more clear in how they operate (add raw levels affected by mastery to effective level, they do NOT trigger on_learn and such and do NOT alter raw level)

dont cheese slipstream

Actors are cleaned of temporary effects upon death even if they do not ressurect, to prevent some effects from lingering after their deaths

Beta3 talent tuning

Slightly decrease the total amount of talent trees on rare+ enemies and restrict the level at which some problematic talents (notably antimagic) begin to show.

See merge request !642

Unless in developer mode, during betas the game will refuse to load most addons; as they only mess up with the testing