Cvar to edit gangs max size.

[Hexer10]

I think that 15 gangs max size is not enoght, maybe a cvar to set the initial gang size and how much is increased after using a upgrade.

[Headline]

Done.
hl_gangs_size_max_upgrades is the new cvar. It's default is nine. The old max was 15 because default gang size was 6 + 9 upgrades. By setting hl_gangs_size_max_upgrades, you can now upgrade past 15 to whatever you set it as'

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