New toggle option (SCFG->System->Toggles->Mouse Hot-spots in Menus/Prompts)

This is for sysops that never want mouse hot-spots in their BBS menus and
prompts (e.g. Kirkman, possibly Deuce) - set to "No".

Setting to "No" also disables the function of the JS console.add_hotspot()
method. Perhaps it should not. <shrug>

Setting to "No" does not disable the terminal mouse support question when
users are setting their terminal defaults. Perhaps it should.

This option should default to enabled (sysops that depend on mouse hot-spots
should double check) - it's enabled in new/stock installs.