Added Waila

Waila v1.3.9
CHANGELOG
v1.3.9
+ Fixed dimension lookup error.
+ Fixed server/client version mismatch.

v1.3.8
+ Ported to 1.6.2
+ [Twilight Forest] Added override to prevent root disapearing. No
special display yet.
+ [GraveStone] Added override to prevent mob spawning. No special
display yet.
+ [AE] Monitors now display their content in the tooltip.
+ Some minor bugs corrections.