Feature: Load map spawns by lua

[ArturKnopik]

Pull Request Prelude

• I have followed [proper The Forgotten Server code styling][code].
• I have read and understood the [contribution guidelines][cont] before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

Addd possibility to load spawns by calling Game.loadMap()

example script:

local testItem = Action()

function testItem.onUse(player, item, fromPosition, target, toPosition, isHotkey)
	Game.loadMap("data/world/forgotten.otbm")
end

testItem:id(2280)
testItem:register()

Fixes #1209

[ranisalt]

@DSpeichert delet this

[ArturKnopik]

issue: #1209

[marmichalski]

Suggested change

	bool loadFromXml(const std::string& filename, bool isLuaLoad = false);
	bool loadFromXml(const std::string& filename, bool isCalledByLua = false);