[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
[libamplayer] Add HEVC format to Android 4.4 patch
[AMLUtils] Change some more permissions

In current Android 4.4.2 sources we need to change
permissions to 666 for following:

    /dev/amvideo
    /dev/amstream_sub
    /dev/amstream_sub_read
    /dev/amstream_rm
    /dev/amstream_mpps
    /dev/amstream_mpts
    /dev/amstream_abuf
    /dev/amstream_vbuf
[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.
[utils] drop ASM from MathUtils::truncate_int() - standard cast to integer does what we want anyway.
[uriutils] add std::string version of IsInternetStream
[fileitem] adds Get/SetURL() to CFileItem to return/set a CURL of the path, and CURL based constructors.
[CURL] make the CStdString constructor explicit, to ensure we capture function conversion to CURL
[stdstring] convert some filesystem based functions to std::string
[uriutils] add CURL versions of various URI processing functions or helpers
[uriutils] rewrite CreateArchivePath() to return a CURL
[filesystem] split the filtering of hidden files from non-allowed files so they can be optimised
[filesystem] adds IDirectory::AllowAll() to take over from IDirectory::IsAllowed to save CURL processing
[filesystem] convert IDirectory interface to use CURL