allow autohosts to open multiple battles

[abma]

it should be possible for bots to open multiple battle at once.

migration path:

• handle battles similar to channels
• distingish battle / channel by channel name, numbers only = battle, name with chars = channel
• in battle, channel owner = host
• battle update commands needs channel name as param

commands needed to be changed:

REMOVESCRIPTTAGS
SETSCRIPTTAGS
SCRIPTSTART
SCRIPTEND
ADDSTARTRECT
REMOVESTARTRECT
UPDATEBOT
REMOVEBOT
ENABLEUNITS
ENABLEALLUNITS
DISABLEUNITS
FORCESPECTATORMODE
FORCEALLYNO
FORCETEAMNO
KICKFROMBATTLE
HANDICAP
MYBATTLESTATUS
LEAVEBATTLE

...

(ugh, list is larger than i thought)

[abma]

related to #57

[abma]

can be easily done after #135 is implemented

[silentwings]

n2s, since channels save stuff to db, can't use battle_id for channel name

[abma]

add the attribute battle_id to channels? :-P

[silentwings]

I'm working on making Battle a derived class of Channel!

[silentwings]

n2s ideas:

FORCETEAMNO, FORCEALLYNO, FORCETEAMCOLOR, FORCESPECTATORMODE, HANDICAP
should be deprecated/combined into a single key=value command e.g.
SETUSERBATTLESTATUS

this leaves the following commands needing changes:
JOINBATTLE LEAVEBATTLE KICKFROMBATTLE
SETSCRIPTTAGS REMOVESCRIPTTAGS
ADDBOT UPDATEBOT REMOVEBOT
RING
plus the following which should probably be subsumed into *SCRIPTTAGS
ADDSTARTRECT REMOVESTARTRECT
ENABLEUNITS ENABLEALLUNITS DISABLEUNITS

[silentwings]

a1c0e85