config: allow disabling color-management

wire/jay_color_management.txt

@@ -0,0 +1,15 @@
+request destroy {
+
+}
+
+request get {
+
+}
+
+request set_enabled {
+    enabled: u32,
+}
+
+event enabled {
+    enabled: u32,
+}

wire/jay_compositor.txt

@@ -101,6 +101,10 @@ request get_toplevel (since = 12) {
     toplevel_id: str,
 }
 
+request get_color_management (since = 14) {
+    id: id(jay_color_management),
+}
+
 # events
 
 event client_id {