* Make context title and summary changeable
Closes#30
* Fix checkboxes on context settings page
So...I am new to Qt, and I forgot that checkboxes can have a label.
Duh. Fixed.
* Put context settings in a different place
* Put ReplaceMessage and ReplaceVariable in Utilities
* Added new lyrics provider with lyrics from AudD and API Seeds
* New improved context widget with albums and lyrics
* Fixed playing and context widget getting stuck in play mode when there was an error
* Changed icons for artists in collection, tidal and cover manager
* Removed "search" icon from "Search automatically" checkbox (right click) that looked ugly
* Removed some unused widgets from the src/widgets directory
* Fixed initial size of window and side panel
* Fixed saving window size correctly
