Support HiresScroll gesture remapping

This commit allows HiresScroll (when target is true) to map the up and
down events to gestures that support it (i.e.AxisGesture/
IntervalGesture). This check is done by checking if wheelCompatibility()
is true.

This also allows hires scroll events to send low-res scroll events as
well.

TODO: Fix bug w/ Chromium (and some other programs?) where mapping
scroll wheel to REL_WHEEL_HI_RES will cause the program to skip events
occassionally. I have literally been stuck on this bug for a week and I
still don't know what causes it. evtest shows proper scroll events,
Firefox works fine, and libinput test-gui reports proper scrolling.

src/logid/InputDevice.cpp

@@ -89,6 +89,17 @@ uint InputDevice::toAxisCode(const std::string& name)
     return _toEventCode(EV_REL, name);
 }
 
+/* Returns -1 if axis_code is not hi-res */
+int InputDevice::getLowResAxis(const uint axis_code)
+{
+    if(axis_code == REL_WHEEL_HI_RES)
+        return REL_WHEEL;
+    if(axis_code == REL_HWHEEL_HI_RES)
+        return REL_HWHEEL;
+
+    return -1;
+}
+
 uint InputDevice::_toEventCode(uint type, const std::string& name)
 {
     int code = libevdev_event_code_from_name(type, name.c_str());