Add "busydialogdelayms" advanced setting.

Provides control over the delay until busy dialog is shown when starting
video playback.
Added a boolean condition to identify the Raspberry Pi platform (System.Platform.Linux.RaspberryPi)
remove old unused renderer files
Show values of string settings with button controls
remove unload/reload of fonts when init/destroy window, as it's not needed anymore
add infolabel Player.Filename
CurlFile: request UTF-8 as preferable charset
CurlFile: don't set 'keep-alive' as cURL do this internally
Some web servers can't properly handle duplicated header value.
[GUIInfoManager] Add VideoPlayer.AudioLanguage infolabel.
[DVDPlayer] Set CMediaSettings::Get().GetCurrentVideoSettings().m_AudioStream on open/set.
revert 5fd167da1ebf407dcb4afa87d1a3bd5a6d66fedb
[Win32] resolution of namespace std:: conflict for bind()
add audio and subtitle language info to video osd if available
[release] version bump to 13.0 alpha10 as we start new merge window
Fix memory leak in SurfaceFlinger.

Call native_window_api_disconnect to free the memory used by OMX video decoder.
Or, there is memory leak in SurfaceFlinger after a stream playback is stopped.
[win32] Use more VC optimizations for important XBMC parts for 'Release' config
* Enable 'Full' code optimization
* Prefer speed over small size
* Allow any suitable inline function
* Enable Generate Intrinsic Functions
* Enable Function-Level Linking
* Enable 'Whole Program Optimization' for compiler, linker and lib task
* Explicitly enable linker optimization /OPT:REF and /OPT:ICF
[win32] Fix various linker warnings
[win32] Fix win32 VS debugging environment. No need anymore to copy dlls to Debug/Release dirs.
[Players] Avoid jumping volume to maximum after trickplay
For players that control volume, if the speed changes (e.g. with ff/rew) the volume gets reset to maximum.
This change sets it back to current value, although I question why it is being changed at all.
Do any players require muting during trickplay?
[win32] don't copy .dlls to debug directory