added new sheet_skill
added new exporter to fill sheet_skill(s)
updated copyright header
Merge branch 'develop' into feature/specific-skill-sheet
fixed exception when a PC try to buy a skill from a category he already mastered
fixed skill ordering ( is_school, rank desc, name asc )
changed font on weapon sheet to reflect the other sheets ( Old Style )
fix what git broke....
Merge branch 'feature/specific-skill-sheet' into develop
another fix on rank advancement with advanced school and path
another fix on rank advancement with advanced school and path
dal submodule update
fix path requirements algorithm
dal submodule update
dal submodule update
dal submodule update
Merge branch 'feature/npc-export-more' into develop

Conflicts:
	src/dialogs/customitems.py
	src/exporters/npc.py