Deleted a bunch of things

Deleted a bunch of things that were found after changing up the way I
copy from my working folder to the git folder
Added a CascadeDeleteAttribute

For the user to specify which child relationships should be deleted with
the parent
Got selects with row numbers working
Allow generic selects to be used externally
Should be able to loop through conditions
Apparently ConcurrentDictionary is a thing

And can help prevent race conditions!
Added GetUnmappedColumns

Added a method to allow the user to get a string containing the columns
that exist in mapped entities but not in the database
More support for the Compact Edition
Added ToString, mostly for debugging
A huuuge amount of changes

I should really be better at updating this thing regularly