Fix drag-handle styling
Extract template of plugin directive
Add pluginSettings directive
Use new settings handling in morph
Introduce arethusaClasses (alias aC)

Will gather frequently used classes among all kinds of code
Use aC in morph
Use new settings syntax in relation
Don't show settings when there are none
Add dynamicDirective directive
Use dynamicDirective, deprecate globalSettingsCustom
Allow custom directives in pluginSettings
Use pluginSettings for artificialToken
Extract pluginSetting directive
Fix floating of settings
Refactor slider
Fix margin of drag-handle
Fix and update arethusaGridHandle
Minor fixes in arethusaGridHandle