Qt: Release all pressed buttons when window focus is lost [rebased]

apt: fix RequestBuilder parameters for Unwrap

credit to @Hawkheart for the original idea

Refactor input emulation & add SDL gamepad support

Reduce host file name and path logging

appveyor: workaround for unnecesary Xamarin log spam

Refined thread launch on syscore error messages

cfg: correctly implement GenHashConsoleUnique

Fix building with MSVC 2017

Fixes typo on Citra forum link.

New website link updates.

Fixed the broken links that were a result of the updated website.

An extra ".citra-emu.org," was left when the link was changed to the current forum URL, so I fixed that.

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

Timer: restore missing signaled=true from #2421

IR: separate functions of each port to their own files

Corrects a few issues with regards to Doxygen documentation, for example:

- Incorrect parameter referencing.
- Missing @param tags.
- Typos in @param tags.

and a few minor other issues.