Multilines scripts improvment

[Nibor62]

Hi there,

Needing more complex things I have tried to use multi-lines filter scripts, but DT actually do not parse them correctly. I am not sure if it is wanted in DT, it is why I'am putting it here.
It is possible to hack it by onelining the script by putting it inside a anonymous function and executing it
(function() { -- fun stuff here -- })()

It seem that the problem come from the dwarfmodelproxy.cpp
matches = matches && m_engine->evaluate("(" + scripts.join(") && (") + ")").toBool();

as the multilines get put between parenthesis. I could be fixed by replacing this line by the following :
for (int i = 0; i < scripts.size(); ++i) { matches = matches && m_engine->evaluate( scripts.at(i) ).toBool(); }