* Implemented ClientMetadataDonor which uses ClientVersionParser to extract the major minor and patch version from the app VERSION_CODE

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Restructured ClientMetadataDonor and added ClientMetadataDonorTests

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Fixed comment in ClientMetadataDonor

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Got rid of ClientVersionWrapper, switched all usages to ApiLevel
Added ability to generate version string to ClientVersionParser
Added ClientVersionParserTest that compares generated string with real one to make sure the parser is working
Changed ClientMetadataDonor to use currentConfig instead of getAppConfig

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Removed ClientVersionParser and put MAJOR, MINOR and PATCH version directly in the BuildConfig

Signed-off-by: Kolya Opahle <k.opahle@sap.com>