Improve items unselections
added base event action of context menu (without implementation)
SubMenu shows
Made Select all
Added show and hide submenu
Made hiding and moving context menu actions
Change a bit context menu actions
Merge conflickt resolved
Merge branch 'develop' of github.com:confa/Azimuth into context-menu-cool
Fixes with selection and multipledragging
Merge branch 'develop' of github.com:confa/Azimuth into context-menu-cool
Made base functionality for context menu for vk tracks and playlist + a bit fixes for context menu view
cleanup
Merge branch 'context-menu-cool' into develop