[desktop] Add basic Frametime/FPS overlay (#3537)

Just displays min, max, avg frametime/fps, alongside a chart of FPS in
the last 30 seconds.

Notes:
- Qt Charts is now required
- FPS/frametime collector now runs 2x as often. TODO: keep status bar at
  500ms, but put perf overlay at 250ms

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3537
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

0 files changed, 0 insertions, 0 deletions