The old system of just defining macros available in some other platform
was susceptible to silently using the wrong code if you forgot to
include a particular header. This fixes a crash on non-Windows platforms
introduced by e1fbac3c.

If the mouse position for a mouse move/drag would take it outside the emulated screen dimensions, clip the coordinates to
the emulated screen dimensions.
Qt and GLFW will report negative coordinates for mouse positions to the left, or above citra window. Added restriction
to mouse coordinates passed to touchmoved by Qt/GLFW to be greater or equal to zero.

The helper classes are rendered obsolete by C++11 lambdas. Also made
formatting conform to our code style.

SVC: Return correct error code on invalid CreateThread processor ID.

SVC: Assert when creating a thread with an invalid userland priority.

 in GetTouchState()

Logging: check for filter before sending to the queue, to skip all heavy formatting on the other thread.

MSVC 2013 (at least) doesn't use QueryPerformanceCounter to implement
std::chrono::high_resolution_clock, so it has bad precision. Manually
implementing our own clock type using it works around this for now.

This allows for easily movable and independent configuration and data directories, using standardized paths.

This was RE'd from the errdisp applet.