Summarized Changelog:
- Refactored all singleton/unique application instance setup logic away from X11/Xcb hackery.
- At last, JACK freewheel mode is now being detected to postpone any active patchbay scans as much as possible.
- Removed old pre-FFADO 'freebob' driver support.
- HiDPI display screen support.
- Graph port temporary highlighting while hovering, if and only if connecting ports of same type and complementary modes.