Update 1.09 - Improved Terrain Generation, Composite Difficulty

Updated terrain generation to have larger “biome” regions and look more natural
Added “composite difficulty” text on the options screen; this is based off of most game options, and will declare how difficult an attrition may be
Instructions screen now has a scrollbar (to make all instructions not shown more obvious)
Gnomes are now always on top (and always visible) when colliding with other units
Leviathans and dragons will now always be on the bottom when colliding with other units