Bump Doxyfile version number.
Fix release - guacd.conf manpage needs to be included in EXTRA_DIST.
GUAC-849: Set AudioPlayback flag if audio is enabled.
GUAC-849: Check for presence of AudioPlayback setting in FreeRDP settings struct.
GUAC-874: Remove detection of FastPath settings. Rely on defaults.
GUAC-874: Load RDPDR and set device redirection if audio enabled.
GUAC-891: Ensure updates are clipped within surface bounds.
Merge branch 'master' into GUAC-844