move lua libs to /logic/scripting/lua/libs

src/logic/scripting/lua/libs/libjson.cpp

@@ -0,0 +1,21 @@
+#include "coders/json.hpp"
+#include "api_lua.hpp"
+
+static int l_json_stringify(lua::State* L) {
+    auto value = lua::tovalue(L, 1);
+
+    bool nice = lua::toboolean(L, 2);
+    auto string = json::stringify(value, nice, "  ");
+    return lua::pushstring(L, string);
+}
+
+static int l_json_parse(lua::State* L) {
+    auto string = lua::require_string(L, 1);
+    auto element = json::parse("<string>", string);
+    return lua::pushvalue(L, element);
+}
+
+const luaL_Reg jsonlib[] = {
+    {"tostring", lua::wrap<l_json_stringify>},
+    {"parse", lua::wrap<l_json_parse>},
+    {NULL, NULL}};