protocol: migrate to stable presentation-time.xml

Remove the unstable presentation_timing.xml file, and use
presentation-time.xml from wayland-protocols instead to generate all the
Presentation extension bindings.

The following renames are done according to the XML changes:
- generated header includes
- enum constants and macros prefixed with WP_
- interface symbol names prefixed with wp_
- protocol API calls prefixed with wp_

Clients use wp_presentation_interface.name rather than hardcoding the
global interface name: presentation-shm, weston-info, presentation-test.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Jonas Ã…dahl <jadahl@gmail.com>
[Pekka: updated wayland-protocols dependency to 1.2]
diff --git a/src/compositor-headless.c b/src/compositor-headless.c
index ba0d8d7..16b5c39 100644
--- a/src/compositor-headless.c
+++ b/src/compositor-headless.c
@@ -34,7 +34,7 @@
 #include "shared/helpers.h"
 #include "compositor.h"
 #include "pixman-renderer.h"
-#include "presentation_timing-server-protocol.h"
+#include "presentation-time-server-protocol.h"
 
 struct headless_backend {
 	struct weston_backend base;
@@ -64,7 +64,7 @@
 	struct timespec ts;
 
 	weston_compositor_read_presentation_clock(output->compositor, &ts);
-	weston_output_finish_frame(output, &ts, PRESENTATION_FEEDBACK_INVALID);
+	weston_output_finish_frame(output, &ts, WP_PRESENTATION_FEEDBACK_INVALID);
 }
 
 static int