Add Gesture support

Only supports OnRelease right now. Also, some bugs were spotted while
writing this:

 - Sometimes deadlocks on startup (cause unknown)
 - Sometimes valid CIDs will be unknown (bug may have been fixed?)

src/logid/CMakeLists.txt

@@ -24,6 +24,9 @@ add_executable(logid
         actions/KeypressAction.cpp
         actions/ToggleHiresScroll.cpp
         actions/ToggleSmartShift.cpp
+        actions/GestureAction.cpp
+        actions/gesture/Gesture.cpp
+        actions/gesture/ReleaseGesture.cpp
         backend/Error.cpp
         backend/raw/DeviceMonitor.cpp
         backend/raw/RawDevice.cpp