fdo#70414 Added generator of VS2012 project files

Change-Id: Ib087a24ae6de049ffb6d93b5ac66452700edddb3
Reviewed-on: https://gerrit.libreoffice.org/7955
Reviewed-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>