Add desktop/source/app/*.cxx for debugging convenience

Change-Id: Idba63c9a88a6f255c58296df64f9d74379a3cc4e
No extension cache to clean unless HAVE_FEATURE_EXTENSIONS

Change-Id: Id19a93b0b428849a3590e2e28e081154c443e949
Add some new source files in vcl

Change-Id: I2908fd1e93e7aa2a515c152508b66d4de38436e6
More sal source files for debugging convenience

Change-Id: I43f693901e10a81c486c4f4b10c9bb9c70af3448
Pretend the app-specific "Documents" directory is the home directory on iOS

Change-Id: If8fda4b27adb2f83cbdfdbb20d90ced77e467a54
Don't try to write into invalid locations on iOS 8

Change-Id: I6a91dbd32bfebf26dbc4a83312cbe5b6af9c4fe5