Move all submodules to extern

.gitmodules

@@ -1,21 +1,21 @@
 [submodule "nod"]
-	path = nod
+	path = extern/nod
 	url = ../nod.git
 	branch = master
 [submodule "amuse"]
-	path = amuse
+	path = extern/amuse
 	url = ../amuse.git
 	branch = master
 [submodule "kabufuda"]
-	path = kabufuda
+	path = extern/kabufuda
 	url = ../kabufuda.git
 	branch = master
 [submodule "jbus"]
-	path = jbus
+	path = extern/jbus
 	url = ../jbus.git
 	branch = master
 [submodule "assetnameparser/tinyxml2"]
-	path = assetnameparser/tinyxml2
+	path = extern/tinyxml2
 	url = ../tinyxml2.git
 	branch = master
 [submodule "hecl-gui"]	
@@ -23,42 +23,42 @@
 	url = ../hecl-gui.git
 	branch = master
 [submodule "sanitizers-cmake"]
-	path = sanitizers-cmake
+	path = extern/sanitizers-cmake
 	url = https://github.com/arsenm/sanitizers-cmake.git
 	branch = master
 [submodule "discord-rpc"]
-	path = discord-rpc
+	path = extern/discord-rpc
 	url = https://github.com/discordapp/discord-rpc.git
 	branch = master
 [submodule "rapidjson"]
-	path = rapidjson
+	path = extern/rapidjson
 	url = https://github.com/Tencent/rapidjson.git
 	branch = master
 [submodule "NESEmulator/fixNES"]
-	path = NESEmulator/fixNES
+	path = extern/fixNES
 	url = https://github.com/FIX94/fixNES.git
 	branch = master
 [submodule "extern/libSquish"]
-	path = hecl/extern/libSquish
+	path = extern/libSquish
 	url = ../libSquish.git
 	branch = master
 [submodule "extern/athena"]
-	path = hecl/extern/athena
+	path = extern/athena
 	url = ../../libAthena/athena.git
 	branch = master
 [submodule "extern/boo"]
-	path = hecl/extern/boo
+	path = extern/boo
 	url = ../boo.git
 	branch = master
 [submodule "extern/libjpeg-turbo"]
-	path = hecl/extern/libjpeg-turbo
+	path = extern/libjpeg-turbo
 	url = ../libjpeg-turbo.git
 	branch = thp
 [submodule "freetype2"]
-	path = specter/freetype2
+	path = extern/freetype2
 	url = ../freetype2
 	branch = master
 [submodule "zeus"]
-	path = zeus
+	path = extern/zeus
 	url = ../zeus.git
 	branch = master