Several fixes and increased readability
add categories
add category preffered words and partial ignore.
Add rpc_url to Transmission options

Fixes  #1832
Update contributing.md

Fixed to say what was intended
Movie category migrate
Combine global and category words
Move providers to main searcher tab in settings
Add categories to settings
Proper meta tag
Check isMac function
Select category for search, suggest & edit
Add Unrar functionality