Add input:touchdevice:td_rotation config

Add support for touch device roation. The rotation is
set globally with `input:touchdevice:td_rotation config` and by
device with `td_rotation` in a device block.

src/helpers/WLClasses.hpp

@@ -326,6 +326,8 @@ struct SIMEPopup {
 struct STouchDevice {
     wlr_input_device* pWlrDevice = nullptr;
 
+    std::string name = "";
+
     DYNLISTENER(destroy);
 
     bool operator==(const STouchDevice& other) {