Split class functions into BitmapInfoAccess.cxx, BitmapReadAccess.cxx
and BitmapWriteAccess.cxx
Split header files into BitmapInfoAccess.hxx and BitmapReadAccess.hxx
Change-Id: I7dcbe1d26c5b64d297658a6b809c93d7ad7f053d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108039
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>