Refactor code. Fix some bugs.

+ Use lazy brain init.
* Move plugin code out of botlib.pm.
+ Now bot can private chatting
* Properly detect real jid if can, extract username from jid
* Change chatid generation, so all previously generated brains will be lost
+ Add !dig and !копать commands
+ Add !cat and !кис commands
* Some other minor changes

.gitignore

@@ -1,4 +1,5 @@
 vendor_perl/**
+data/brains/**
 data/config.json
 data/*.sqlite
 data/cache/**
@@ -8,3 +9,4 @@ data/karma/**
 data/lat/**
 TODO
 *.pid
+*.log