Refactor to initialize kwtemplater only once during reposetup - when overwriting kwtemplater was initialized (and the same keyword regex compiled) before and with every file read. - therefore remove overwrite from kwtemplater, and make it private method. _ matcher becomes attribute of kwtemplater. - by making kwtemplater a global, avoid adding attribute to ui.

Rename kwtemplater.t to kwtemplater.ct