Feature: add topic-list-{add,del}

[macTijn]

Add 2 new commands to the topic module:

• topic-list-add <topicpart> <word>
• topic-list-del <topicpart> <word>

Example

 -!- Topic for #channel: http://fifo.sh/ | some more topic
 <User1> !topic-add Drinks 8pm @bar: Moron,User666
 -!- Bot has changed the topic of #channel to: http://fifo.sh/ | some more topic | Drinks 8pm @bar: Moron,User666
 <User1> !topic-list-add 3 User1
 -!- Bot has changed the topic of #channel to: http://fifo.sh/ | some more topic | Drinks 8pm @bar: Moron,User666,User1
 <User1> !topic-list-del 3 Moron
 -!- Bot has changed the topic of #channel to: http://fifo.sh/ | some more topic | Drinks 8pm @bar: User666,User1

recognizing a list might be accomplished by 2 things:

• an existing list, where words are separated by a comma
• a colon at the end of the description part

[bart]

fixed in 0.8.2