Replace ':' with '/' as default port separation syntax for Tcl addbot syntax

[vanosg]

Make using /s for port separation the default documented method for IPv4 and IPv6, still leaving the current : support in code to maintain backwards compatibility. See #470 for background.

[Cizzle]

Would be slightly more consistent with the +bot and chaddr partyline commands. Whatever is decided (and I think related previous discussion favoured spaces), best to be consistent all over. Would that be for 1.9 or 2.0?

[vanosg]

Agreed, spaces would standardize a bit more. If we wanted to pursue this, I would propose:

• Accepting spaces or :s in 1.8.x (remove /s all together, as we haven't published the /s as a standard in 1.8 yet)
• Making spaces default in 1.9.0, still allow :s
• Removing :s in 2.0

[vanosg]

I don't think there is anything to do on this for 1.9; spaces are already documented as 'the way' via #496 and :'s are documented as marked as deprecated. The world is at peace. Moving this task to 2.0