Until browsig playlist and channels is supported only show vides in search results

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
Add simle versioning support.

Base version number is specified in YTPlayer.yaml file. If .git
directory is present shor revision hash is also appended to the version
string. QML can access it via NativeUtil.version property.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>