Add OnLearnChangeVariableResettable

Use appropriate constructor for Scene_SkillTrees

add more informative description for error in jp() without class

Fix bug when change class for actor with no trees

Update version

Reworked error when database does not contain skill with ID

Add script calls to reset trees

Fix typo

Add understandable text for no skill ID error

Update skill requirements for example skill combatReflexes2

Replace "var" by "let"

Fix bug with no actor on first scene push

Reworked example skills

Fix cast cost alignment

Issue#26 Parameterize text for skill icons