Searching UNO in Windows registry currently doesn't work

[xbubli]

Now that noa-libre comes with OfficeLoader that will try to find UNO on the system in the following places & following order:

1. noa configuration ( IOfficeApplication. APPLICATION_HOME_KEY )
2. com.sun.star.lib.loader.unopath Java property
3. UNO_PATH environment variable
   4a. (Windows only) Registry key Software\LibreOffice\UNO\InstallPath
   4b. (Linux/Mac) PATH env.variable
4. (Linux/Mac) 'which soffice'

the point 4a isn't quite implemented in new code yet. FIXME is planted in WinRegKey.java class in the following commit: 0f71008

Since registry.jar is shipped w/ noa-libre and already used in noa-libre code, we should use it to read Win registry and find UNO install path also in InstallationFinder/WinRegKey classes. Relying on unowinreg.dll won't work in most of the installations, as one needs to have LibO SDK installed