Merge branch 'master' of https://github.com/Anuken/Mindustry into 4.0

# Conflicts:
#	core/assets-raw/sprites/blocks/chainturret-icon.png
#	core/assets-raw/sprites/blocks/chainturret.png
#	core/assets-raw/sprites/blocks/titancannon-icon.png
#	core/assets-raw/sprites/blocks/titancannon.png
#	core/assets/sprites/sprites.atlas
#	core/assets/sprites/sprites.png
#	core/assets/version.properties
#	core/src/io/anuke/mindustry/entities/effect/TeslaOrb.java
#	core/src/io/anuke/mindustry/graphics/BlockRenderer.java
#	core/src/io/anuke/mindustry/input/InputHandler.java
#	core/src/io/anuke/mindustry/input/PlaceMode.java

android/src/io/anuke/mindustry/AndroidLauncher.java

@@ -115,6 +115,8 @@ public class AndroidLauncher extends AndroidApplication{
 								+ Character.digit(s.charAt(i + 1), 16));
 					}
 
+					if(new String(Base64Coder.encode(data)).equals("AAAAAAAAAOA=")) throw new RuntimeException("Bad UUID.");
+
 					return data;
 				}catch (Exception e){
                     Settings.defaults("uuid", "");