This commit fixes several kernel object leaks. The most severe of them
was threads not being removed from the private handle table used for
CoreTiming events. This resulted in Threads never being released, which
in turn held references to Process, causing CodeSets to never be freed
when loading other applications.

Buffer lengths should be size_t, and file offsets should be u64.

This is exposed in the GUI as a new "CiTrace Recording" widget.

Playback is implemented by a standalone 3DS homebrew application (which only runs reliably within Citra currently; on an actual 3DS it will often crash still).

Visual Studio 2015 defines this in stdio now

Applets are now cleaned up in AppletUpdateEvent after calling their respective Update method.

The code now properly configures the process image to match the loaded
binary segments (code, rodata, data) instead of just blindly allocating
a large chunk of dummy memory.

Currently only the SWKBD is emulated, and there's currently no way to ask the user for input, so it always returns "Subv" as the text.

This isn't used, and there's no implementations of the member functions.

For the signed case, the shifts already remove the rest of the value, so
ANDing by the mask is redundant.

Fixes #913

This will help packaging tremendously, as a `make DESTDIR=… install` will now
put every file at their place (on Linux and related).