Commands and init improvements
* 'lua' command in C
* add_command and del_command merged
* de-hardcoded initialization file name
# lua function name to be called on hooks invocationsetlua_hook_function=hook_handlersetlua_init_filename=~/.mcabber/mcabberrc.lualoadmcabber-lua# :(#lua dofile 'mcabberrc'