Rename screenshooter protocol to weston_screenshooter

Due to the effort of moving a way from non-prefixed protocols, rename
the weston specific screenshooter protocol to weston_screenshooter.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Mariusz Ceier <mceier+wayland@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/protocol/screenshooter.xml b/protocol/weston-screenshooter.xml
similarity index 71%
rename from protocol/screenshooter.xml
rename to protocol/weston-screenshooter.xml
index 76e3c85..8c4486c 100644
--- a/protocol/screenshooter.xml
+++ b/protocol/weston-screenshooter.xml
@@ -1,6 +1,6 @@
-<protocol name="screenshooter">
+<protocol name="weston_screenshooter">
 
-  <interface name="screenshooter" version="1">
+  <interface name="weston_screenshooter" version="1">
     <request name="shoot">
       <arg name="output" type="object" interface="wl_output"/>
       <arg name="buffer" type="object" interface="wl_buffer"/>