As result, gossip for GO is now possible. Moved related data structures and remove useless from code.
Please note that after some time, table npc_gossip will be fully removed (use menuId in _template in relation to gossip_menu as replacement).
Special thanks to GriffonHeart for help with research, discussions and ideas of code and thanks to Vladimir for helpful input.
Signed-off-by: NoFantasy <nofantasy@nf.no>
