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.

Replace built-in Profiler with indicators in status bar

Now based on std::chrono, and also works in terms of emulated time
instead of frames, so we can in the future frame-limit even when the
display is disabled, etc.

The frame limiter can also be enabled along with v-sync now, which
should be useful for those with displays running at more than 60 Hz.