Adds a working door to move between Mournhold (Plaza Brindisi Dorom) and TR's current Almalexia.

The usual disclaimers apply: the Almalexia in TR1510 is temporary and will be reworked, you can potentially screw up the Tribunal main quest by moving to Mournhold before you first get attacked by an assassin, Mournhold is non-euclidean and you will be eaten by the Hounds of Tindalos for blasphemy, etc. etc.

This plugin is no longer necessary if you use the TR_Travels contained in TR1512. Do not use both at the same time!