Add Venetian Input Method

Input method for vec.wiki, vec.wikt and vec.source. It' based on esperanto x-system (eo-x). You can find the discussion on vec.wiki VIllage Pump:
http://vec.wikipedia.org/wiki/Wikipedia:Ci%C3%A0co%C5%82e#VisualEditor.2C_carateri_specia.C5.82i_e_Universal_Language_Selector