Add 2nd optional parameter to HedgewarsScriptLoad. If false, its OK if file does not exist. Also, return true/false on success
-- Library for parameters handling
params = {}
function parseParams()
if ScriptParam ~= nil then
for k, v in string.gmatch(ScriptParam, "(%w+)=([^,]+)") do
params[k] = v
end
end
end