abandon generic query frag for common structures
Instead of using the QueryFrag struct, which was too generic to be
generally useful, we have moved to a BusEventFilter type, which
contains things we may filter on when we're searching for bus events.
At the moment it just contains names, and start/stop times.
Then in each function we can accept this filter struct and convert
it to fit the query.
We also support general modifiers, and currently have one implemented:
the LimitOffsetModifier. This adds a LIMIT and OFFSET clause to any
statement. these are all applied at the end and receive a stringbuilder
which may prevent certain operations from being structured.
We need to work on this one more, potentially abandoning.
delete mprpc
move can frame to it's own library
create CANID type (better extended id support)
rework database format, only uses name + json now
busEvent and rawJsonEvent don't store the Id anymore
