0.5.0

Lots of improvements, but may be more unstable than previous releases. Probably last release for a while.

• merged upstream one last time (itdelatrisu/opsu@aa1babe)

+ new feature, ^ improvement, ! bugfix, - deleted feature

+ rewrote base system, less slick, less overhead, more control, performance improvements
+ resolution & skin can be changed without restarting
+ added bubble notifications (#111)
+ preparations for multi-mirror (#44)
+ ExGon mover
+ option to color the main menu logo with the cursor tint (#82)
+ option to draw slider endcircles
+ storyboard v2 concept
+ dancing hitcircles
! workaround/fix for slidercurves being used as reversearrow (#114)
! fixed path issue on some windows10 machines
^ improved options menu, with search functionality (#121)
^ fancy fps meter
^ fancy audio volume control
^ lots of default skin element changes, reducing jar size
^ separated updates per second and frames per second
^ added animations to notification bar
^ mirrored sliders can be merged now
^ better dev experience regarding native libs
^ fancy new cursor stuff, including distance-based rainbow trail and additive rendering options
^ pulse main menu logo when no music is playing (#105)
^ song history makes sense now (main menu & selecting previous random map)
^ more responsive UI
^ completely rewritten song list, has a smooth experience now
^ slightly rework error dialog UI/flow
^ LOTS of UI changes
^ minor improvements
- removed download menu