Replace xprop to ctypes based solution
Correct onClickTitlebar method usage (#36)
Change attributes

* `htitlemode` doesn't have `legacy` value anymore.

* Add `htitlemethod` attribute.

* Rename `htitle-button-layout` to `htitlebuttonlayout`.

* Remove `hidetitlebarwhenmaximized`.
Drop Fx 24-28 versions support
Reorder and cleanup HTitleTools.jsm
Rename settings.xul to options.xul
Create HTitleWindowControls.js