[10305] Add additional AddMenuItem function for GossipMenu

[newsbot]

<pre>m src/game/GossipDef.cpp
m src/game/GossipDef.h
m src/shared/revision_nr.h

[10305] Add additional AddMenuItem function for GossipMenu

This version allows using id of some text from database instead of text itself,
and will then simplify locales especially from script side.

Thanks to Vladimir who woke up to hundreds of questions and lines of weird test
code, helping me out with all the stuff i didn't understand (which was about 75%
of the changes done in here :P )

Signed-off-by: NoFantasy <nofantasy@nf.no></pre>



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