Massive SCP DLL rewrite

[nefarius]

Resolves #213

Changes

• Device state is now only modified once on library load, afterwards event based instead of being tied to any XI proxy calls.
• Basically rewrote everything.
• Proxying "real" XInput devices is now supported, so the DLL doesn't need to be swapped/deleted if the user simply wants to use Xbox devices with the affected game or emulator.
• Used C++ (sparingly) for better abstraction and maintenance.

Open TODOs

• OTEL doesn't build yet
• Massive amount of testing
• Address some inconsistencies
  • Currently only the XInputGetExtended API is doing jitter compensation on the axis values, should XInputGetState and XInputGetStateEx do the same? Or should it be removed entirely since v3 supports deadzone configuration? However the SCP lib uses the SXS feature report which always comes back unaltered so maybe option one makes more sense. The packet counter helper function is affected by this too, it is way too sensitive in incrementing the value while the controller is idle.