Add minetest.settings to CSM API and allow CSMs to provide settingtypes.txt (#12131)

Co-authored-by: sfan5 <sfan5@live.de>
Co-authored-by: SmallJoker <SmallJoker@users.noreply.github.com>

src/script/scripting_client.cpp

@@ -35,6 +35,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_nodemeta.h"
 #include "lua_api/l_localplayer.h"
 #include "lua_api/l_camera.h"
+#include "lua_api/l_settings.h"
 
 ClientScripting::ClientScripting(Client *client):
 	ScriptApiBase(ScriptingType::Client)
@@ -73,6 +74,7 @@ void ClientScripting::InitializeModApi(lua_State *L, int top)
 	LuaLocalPlayer::Register(L);
 	LuaCamera::Register(L);
 	ModChannelRef::Register(L);
+	LuaSettings::Register(L);
 
 	ModApiUtil::InitializeClient(L, top);
 	ModApiClient::Initialize(L, top);