Only check OpenGL shader log if size is >1.

This prevents a crash when the buffer size returned by the driver is 0,
in which case no space is allocated to store even the NULL byte and
glGetShaderInfoLog errors out.

Thanks to @Relys for the bug report.

emu_window_glfw.cpp: Fixed graceful quitting

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.

Implemented graceful closing of the GLFW window, along with emulation.

OpenGL Refactor

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

The OpenGL renderer has been revised, with the following changes:
 - Initialization and rendering have been refactored to reduce the number of
   redundant objects used.
 - Framebuffer rotation is now done directly, using texture mapping.
 - Vertex coordinates are now given in pixels, and the projection matrix
   isn't hardcoded anymore.

This name better represents what the enum does, and is less overloaded
in the context. (The whole register the enum is part of is also called
'format'.)

Also make destructor virtual so that instances are properly destructed.

Fix warnings in video_core

APT:U Added a stub fuction for "GlanceParameter"

Configuration files

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

Fix the filesystem implementation in order to get blargSnes to run

Core: Fix the SDMC Directory implementation to make blargSnes work.

FileSys: split the constructor into an Open method, in order to notify the opener something went wrong.
Kernel: Return an invalid handle to OpenFile when it failed to open.

Added some more names to the function table

Added "SetApplicationCpuTimeLimit" and "GetApplicationCpuTimeLimit" to apt.cpp

Added "StoreDataCache" to the function table

seems simple enough

Fix warnings in core and common

chunk_file: General cleanup

Use the citra user path for the sdmc directory

- Remove unnecessary ifdefs
- Remove commented out code. Can be retrieved later if needed.

Implement filesystem services, and the required kernel objects.