Add HTTPS Lua module.

It can be loaded via https = require("https").
Basic API is responsecode, body = https.request(url).
Slightly more advanced API is responsecode, body, headers = https.request(url, {method="post" or "get", data=str, headers={}}).

src/modules/love/love.cpp

@@ -173,6 +173,10 @@ extern "C"
 	extern int luaopen_love_arg(lua_State*);
 	extern int luaopen_love_callbacks(lua_State*);
 	extern int luaopen_love_boot(lua_State*);
+
+#ifdef LOVE_ENABLE_LUAHTTPS
+	extern int luaopen_https(lua_State*);
+#endif
 }
 
 static const luaL_Reg modules[] = {
@@ -656,6 +660,9 @@ int luaopen_love(lua_State *L)
 #ifdef LOVE_ENABLE_LUA53
 	love::luax_preload(L, luaopen_luautf8, "utf8");
 #endif
+#ifdef LOVE_ENABLE_LUAHTTPS
+	love::luax_preload(L, luaopen_https, "https");
+#endif
 
 #ifdef LOVE_ENABLE_WINDOW
 	// In some environments, LuaJIT is limited to 2GB and LuaJIT sometimes panic when it