Moved over from #3266 in citra.

* Update bootmanager.cpp

* This *should* fix the clang error

* Added support for network with ENet lib,

connecting is possible, but data can't be sent, yet.

* fixup! Added support for network with ENet lib,

* fixup! CLang

* fixup! Added support for network with ENet lib,

* fixup! Added support for network with ENet lib,

* fixup! Clang format

* More fixups!

* Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Clang again

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

Optimized messages that were repetitive and added ability for core errors to specify more details optionally.

- Made LoadKernelSystemMode return a pair consisting of a system mode and a result code (Could use review).
- Deleted ErrorOpenGL error code in favor of just having ErrorVideoCore.
- Made dialog messages more clear.
- Compared archive ID in fs_user.cpp to ArchiveIdCode::NCCH as opposed to hex magic.
- Cleaned up some other stuff.

video_core didn't even properly use them, and they were the source of
many otherwise-unnecessary dependencies from core to video_core.

credit to @Hawkheart for the original idea

1. removed zl, zr and c-stick from HID::PadState. They are handled by IR, not HID
2. removed button handling in EmuWindow
3. removed key_map
4. cleanup #include

Nightly builds now have "Citra Nightly" in the titlebar
Bleeding edge builds now have "Citra Bleeding Edge" in the titlebar

* Removes circular dependences (common should not depend on core)

Allows users to choose a single screen layout or a large screen layout.
Adds a configuration option to change the prominent screen.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

* Make Citra build with MICROPROFILE_ENABLED set to 0

* Buildfix with microprofile kept on

* moc did not like a dialog to conditionally exist.

* Cleanup

* Fix end of line

This stops (for some reason sporadic) crashes and OpenGL errors during
shutdown, when the OpenGL renderer tries to clean up objects from the
UI thread, which has no OpenGL context active.