(WIP) Enhance account tracking abilities

[vanosg]

a PR that tracks adding get_user_by_account() where appropriate, to complement get_user_by_host(). This will allow Eggdrop to track a user by their account name (first), and then check a hostname. The assumption here is that account names are more precise and less prone to collisions/spoofing than a hostmask.

[vanosg]

update for all channels- remove strlcpy Does this break Tcl binds (the userhost arg passed to a function?)

[vanosg]

#1369 tracking