DSP: Print hash of firmware to console

Loader/NCCH: Log the program ID during loading

This is useful for all sorts of things, but mainly to identify save
folders more easily.

ac:u IsConnected implemented

Stub CAM:U service

externals: Remove unused GLFW library from the repo.

Update Building Links

Links on README.md don't exist.

Add immediate mode vertex submission

Dependencies: Remove GLFW, Add SDL2

Add THREADPROCESSORID_ALL on SVC::CreateThread

citra: Remove GLFW, Add SDL2

FindSDL2: Do not CACHE SDL2_* variables if library is not found

EmuWindow_SDL2: Set minimal client area at initialisation time

EmuWindow_SDL2: Corrections

EmuWindow_SDL2: Fix no decorations on startup on OS X

cmake: windows_copy_files

DiskDirectory: Initialize the directory member with valid info.

Service/CFG: Add block 0x000A0000 (username) to default config file

x64 Emitter: Fix L bit in VEX prefix

Initial implementation ir:user

Add check before closure when emulation is running

renderer_opengl: Initalise fragment shader LUT textures

Audio Core: Skeleton

Add website to README. Be proud of it!

Add support for padding vertex attributes

This commit:
* Adds a new subproject, audio_core.
* Defines structures that exist in DSP shared memory.
* Hooks up various other parts of the emulator into audio core.

This sets the foundation for a later HLE DSP implementation.

BitField: Make trivially copyable and remove assignment operator.

Thanks to @mailwl for the initial version of the stubs.