Added subfolder modded_maps to ./map_gen/maps.

[Soggs]

To organize all the adapted map scripts and store them in a central location. So they do not get lost in the limbo of saves and scenario files.

[SimonFlapse]

Travis is complaining :)

map_gen/maps/modded_maps/triangle_of_death_for_Angels_Refining.lua:14:7: unused variable Event
map_gen/maps/modded_maps/triangle_of_death_for_Angels_Refining.lua:111:16: unused function init_weapon_damage
map_gen/maps/modded_maps/triangle_of_death_for_Angels_Refining.lua:166:7: value assigned to variable sea is overwritten on line 167 before use
map_gen/maps/modded_maps/triangle_of_death_for_Angels_Refining.lua:196:16: unused function uranium_transform
map_gen/maps/modded_maps/triangle_of_death_for_Angels_Refining.lua:356:16: unused function loot

[theorangeangle]

@Soggs make travis happy and we can merge 😄

[grilledham]

Maybe the modded_maps folder should be renamed to just modded, it is already in a folder called maps.