Add nlohmann json submodule third party dependency

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "thirdparty/catch2"]
 	path = thirdparty/catch2
 	url = https://github.com/catchorg/Catch2.git
+[submodule "thirdparty/json"]
+	path = thirdparty/json
+	url = https://github.com/nlohmann/json.git

premake5.lua

@@ -75,6 +75,7 @@ workspace "OpenAssetTools"
 include "thirdparty/catch2.lua"
 include "thirdparty/libtomcrypt.lua"
 include "thirdparty/libtommath.lua"
+include "thirdparty/json.lua"
 include "thirdparty/minilzo.lua"
 include "thirdparty/minizip.lua"
 include "thirdparty/salsa20.lua"
@@ -85,6 +86,7 @@ group "ThirdParty"
     catch2:project()
     libtommath:project()
     libtomcrypt:project()
+    json:project()
     minilzo:project()
     minizip:project()
     salsa20:project()

src/ObjWriting.lua

@@ -52,6 +52,7 @@ function ObjWriting:project()
 		
         self:include(includes)
 		Utils:include(includes)
+		json:include(includes)
 		minilzo:include(includes)
 		minizip:include(includes)
 end

thirdparty/json

@@ -0,0 +1 @@
+Subproject commit 4f8fba14066156b73f1189a2b8bd568bde5284c5

thirdparty/json.lua

@@ -0,0 +1,23 @@
+json = {}
+
+function json:include(includes)
+	if includes:handle(self:name()) then
+		includedirs {
+			path.join(ThirdPartyFolder(), "json", "single_include")
+		}
+	end
+end
+
+function json:link()
+end
+
+function json:use()
+	
+end
+
+function json:name()
+    return "json"
+end
+
+function json:project()
+end