MainFrm: Display an OSD reminder that D3DFullscreen is turned on.
AppSettings: Changed hotkey for D3D Fullscreen and disabled FTC hotkey by default.

These two hotkeys were easily triggered, cause a lot of confusion and are not that useful to the average user.
VideoRenderers: Move VSyncThread from DX9AllocatorPresenter to EVRAllocatorPresenter.

Only EVR-CP was using the thread, so it should be part of that class. This also gives us access to the RenderState which now prevents the thread from running while paused.

Fixes #593.
EVR-CP: Update disabled Multimedia Class Scheduler code.
And fix a typo.
Updated Simplified Chinese translation.
Updated German translation.
Fix a nonsensical cast (double --> float --> double).
Add support for sending "Now playing" information to Skype.

This commit fixes #2935.