[interfacekit] MimeDatabase

I just checked in the beginnings of the mime database code. It 
currently expects to find the database at ~/config/settings/obos_mime 
instead of ~/config/settings/beos_mime (so as not to trash your 
database if I do something stupid ;-), so you'll either need to make a 
copy yourself or change the string constant in MimeDatabase.cpp to 
point somewhere else if you feel like playing around with BMimeType 
(though the obos BMimeType tests make a copy if they need to).

I have one question currently. I'm a bit perplexed with 
BRoster::_Start/_StopWatching(). I can't figure out what would be 
gained by implementing BMimeType::Start/StopWatching() via said BRoster 
calls vs. just using _send_to_roster(,,true) to talk to the MimeManager 
directly (the latter being the way I've implemented it currently). As 
best I can tell, that's what BRoster::_Start/_StopWatching would have 
to do eventually anyway, but at the cost of filtering the necessary 
information through a somewhat contrived interface designed to be used 
by two notably different monitor services (namely 
BRoster::Start/StopWatching() and BMimeType::Start/StopWatching), and 
with no other apparent gain. Or am I missing something? 

-Tyler

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