ImmersiveFX 1.2.0

New release with many improvements!

First of all, some new documentation for developers was added. Then a new thread management that allows stopping and killing was added. It also simplifies ScreenFX a lot and enables an interface that allows to control ImmersiveFX while running!

FPS were also decoupled for each thread to better fine tune performance/latency. For this, the old frame time warning (spam) was entirely replaced with a one-line updating frametime display.

Also, the exit handling was finally fixed so when exiting, all threads are cleanly ended.

ImmersiveFX 1.1.0

kinda missed releasing this one, so I do it now for the sake of completeness.

On top of the last release, it adds various new options for device color adjustments and some fixes.
Also added a new single-threaded flag.

ImmersiveFX 1.0.1

The requirements weren't up to date and the readme slightly incorrect

ImmersiveFX 1.0.0

Merge pull request #7 from MaWalla/threadloop

overhauled entire codebase to use threads properly