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.

Involves making asserts use printf instead of the log functions (log functions are asynchronous and, as such, the log won't be printed in time)
As such, the log type argument was removed (printf obviously can't use it, and it's made obsolete by the file and line printing)

Also removed some GEKKO cruft.

It will print a message to know what happened in case something went wrong in a GLFW call.

Also replace every printf() in the glfw emu-window by ERROR_LOG().

GLFW provides no proper support for this, hence we just allow any window size to be used.

The window title is none of the emulation core's business. The GUI code is free to put whatever it wants there.
Providing properly thread-safe window title getters and setters is a mess anyway.

The view is scaled to be as large as possible, without changing the aspect, within the bounds of the window.
On "retina" displays, or other displays where window units != pixels, the view should no longer draw incorrectly.

In PR #143, the name of the function IsOpen was originally ShouldClose, but was changed. The function's caller was changed to reflect this, but the return value wasn't.

This should fix context creation on OS X. Also requests a core context on all platforms in Citra-GLFW, for consistency.

Uses QSettings on citra-qt, and inih on citra-cli.

- cleaned up window title
- cleaned up emu_window_glfw/emu_window