April sync (#360)

* Maps and things no code/icons

* helpers defines globalvars

* Onclick world.dm orphaned_procs

* subsystems

Round vote and shuttle autocall done here too

* datums

* Game folder

* Admin - chatter modules

* clothing - mining

* modular computers - zambies

* client

* mob level 1

* mob stage 2 + simple_animal

* silicons n brains

* mob stage 3 + Alien/Monkey

* human mobs

* icons updated

* some sounds

* emitter y u no commit

* update tgstation.dme

* compile fixes

* travis fixes

Also removes Fast digest mode, because reasons.

* tweaks for travis Mentors are broke again

Also fixes Sizeray guns

* oxygen loss fix for vore code.

* removes unused code

* some code updates

* bulk fixes

* further fixes

* outside things

* whoops.

* Maint bar ported

* GLOBs.

code/datums/map_config.dm

@@ -77,7 +77,7 @@
         
     defaulted = FALSE
 
-#define CHECK_EXISTS(X) if(!istext(json[X])) log_world(X + "missing from json!")
+#define CHECK_EXISTS(X) if(!istext(json[X])) { log_world(X + "missing from json!"); return; }
 /datum/map_config/proc/ValidateJSON(list/json)
     CHECK_EXISTS("map_name")
     CHECK_EXISTS("map_path")
@@ -141,6 +141,3 @@
 
 /datum/map_config/proc/MakeNextMap()
     return config_filename == "data/next_map.json" || fcopy(config_filename, "data/next_map.json")
-
-/datum/map_config/proc/MakePreviousMap()
-    return config_filename == "data/previous_map.json" || fcopy(config_filename, "data/previous_map.json")