Renamed ApiLevel VM to better reflect its origin
Added more helper methods into diagnostic logs
Removed duplicates, when detecting installed NDKs

Matching is based on paths (host & target). The NDK with longer name is
preffered.
Alignment fix on LogsOption control
Implemented API Level selection settings
Logs settings now setup a path via 'Browse...'
Debug builds has hardcoded paths to my repo
Fixed crash, when async call to non-existing tool
Added simple dialog to add new device target
Extended menu to have secondary section for targets

The intention here is to have two sections for quick switches:
 - for target devices
 - for API levels

Functionalities for the first one still are under development.