On Win32:
- Binaries and libraries will be installed by default in <PREFIX>/bin
- The prefix is set to `Program Files/openmohaa` by default
On Unix:
- Binaries and libraries will be installed by default in <PREFIX>/lib/openmohaa
- Shared data will be installed in <PREFIX>/share/applications, <PREFIX>/share/metainfo and <PREFIX>/share/icons
- The prefix is set to `/usr/local` by default
This removes the use of the DESTINATION parameter from install() command and instead rely on default values.
The shared build action file was modified to package installed files in a single folder
