build: make bootstrap script fail properly on failure

If the first command in the bootstrap script fails, exit with non-zero
exit status instead of silently continuing to the next command.
check mime type of internet streams. allows hls playlists without m3u8 extension to be played
FIX: do not popup OSD on DVD menu with touch or mouse
[addons] switch general.addonupdates to an integer setting. Skins can use a button control for the setting instead of a
toggle.
[addons] adds 'never' as an option for the addon update setting
[confluence] use a button for the addon update setting to allow for 'never' as an option
[addons] change root of add-on manager to unsorted rather than sort by label
[addons] adds LastRepoUpdate() to the add-on installer
[addons] adds 'Check for updates' to the root of the add-ons manager.
[addons] show all add-ons in the add-on manager, including libraries/modules/helpers
ADD: [sets] allow to select art from child movies
[win32] remove unneeded local helper
[omxplayer] Remove PCMRemap and handle multichannel mixing like ActiveAE

omxplayer uses pre-ActiveAE code for determining multichannel mixing.
Some of the decisions made with lfe and side/back channels are different.

I think it is better to match latest xbmc code exactly, and so use
ffmpeg to determine the mixing matrix in the same way as Pi Sink does.
Add GetDescription() to CGUITextBox
Add getText() to ControlTextBox
[win32] Implement class CWin32Directory
[win32] DirectoryFactory: use CWin32Directory class
Remove HDDirectory as not used now
[darwin] CPUInfo: remove duplicated CPU features reading and update ReadCPUFeatures(), fix potential buffer overrun
[win32] CPUInfo: properly initialize CPU cores info under win32
CPUInfo::getUsedPercentage: round result