remove hook_loader and use add_action
Simplify categories settings function. Make use of arguments
Add new Settings Tab "Shows"

The new Shows tab has sub menu with all existing shows and loads a new page with corresponding GET variable
Add player only if audio or video type exist
get shows can return all shows with flag $hide_emtpy
Create show based settings page with general asset field as example
Add first iTunes specific settings field
Change MVC structure. Pass controller to view and model and provide getter function
Finish show specific settings. Closes #9
Remove old settings code.
Print Show name instead of slug as title
Add show specific settings to changelog
Merge branch 'feature/improve_settings' into develop