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
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
[win32] CPUInfo: implement reading current frequency and CPU cores loads