UI fixes

Big improvements to DPLII.
Added support to change Cubeb audio settings at runtime, and improved the same thing for WASAPI.
Fixed build on linux/mac.
Finished input code and cleaned it up.
Made FreeSurround safer and fixed support for changing sample rate at runtime.
Added GetActualEmulationSpeed() to Core

Implemented it for Win Mouse.

Add some more tooltips to input mapping widgets.
Add edit condition to numeric settings (e.g. a setting that doesn't make sense unless another one is enabled).
Fix group disabling leaving some widgets not grayed out.
Increase mapping widget refresh rate from 30 to 60 (making them smoother)

global setting iLatency to iAudioBackendLatency.
ini setting AudioLatency to AudioBackendLatency.
Both were confusing, especially with all the new implemented audio (and latency) settings.

Haven't proven it myself but @LAGonauta said he could clearly hear the difference between 40 and 80ms despite FreeSurround saying to not go over 20ms of block size.

-Added a space between values and "Hz".
-Also slightly refactored a few other things in the audio pane, mostly the alignment.

Plus Audio Pane cleanup

And wrote some code to refresh WASAPI devices every time users click on the list

With PulseAudio and OpenAL.
Plus Audio Pane improvements.

-DPLII support
-Emulation pause and unpause fixes/support.
-Memory leaks
-Safety/cleaning up

…d on the backend latency

Making the best compromise between quality and latency.
Also added config/setting "DPL2PerformanceOverLatency" to prioritize performance over anything else.

It's not really "safe" as more than one device could have the same name.
It's now saved by device unique ID (assigned by Windows).
Also fixed a few memory leaks in WASAPI.

-Improved code to auto determine best DPLII block size (it turned out to be mostly useless so I will get rid of it)
-Small DPLII fixes

-Uniquely defined all sound beckends in themselves, as a lot of their settings/capabilities were spread around the UI code.
-Added UI information for when a backend has failed to start.
-DPLII WIP (messy, full of debug stuff)

If bound to the same key as "Disable Emulation Speed Limit" and the machine is capable of running the game at 100% speed,
it can be used as a workaround for bug:
https://bugs.dolphin-emu.org/issues/10254

Hopefully it does some internal optimization.