HollowSkills v0.3

Changed the last lesson cooldown timer calcul (now takes all skills in
the same category into account)
Cleanup, changed the SQL tool to the default PluginBase one.
HollowCrafting v0.1

Basic set up
HollowSkillBooks v0.3

Added the time before next lesson in messages
HollowLanguages v0.4

Changed the yml file for players for a MySQL table (hollowskills one).
HollowPluginBase & HollowCore v1.1

Updated base classes to include a MySQL linker for all projects
HollowKingdoms

Update for TODOs
HollowCalendar small update

To follow HollowPluginBase changes