Main changes
- clickable.json added
- arm64 version of owncloudcmd is 2.5.3; arm32 remains unchanged
- arch detection and paths to owncloudcmd changed in *OwncloudSyncd/owncloudsyncd.cpp
- arch detection and paths for libs added to *OwncloudSync/servicecontrol.cpp*
- included support for owncloud account in ubuntu-touch (up to now, only nextcloud account was used, even those behave equaly from the UBsync point of view)
- number of minor fixes in UI