Remove frmROM

ROM importing will (eventually) be done as part of creating a new
project, we can hold off the UI until then, importing only takes a
couple of seconds at the moment.
Renamed frmSplash to frmROM (that will confuse you!)

This is the form that will appear when a Sonic 1 ROM cannot be found in
the user's app data. The user will drag a ROM onto this form and it will
copy it into the app data so it's always on hand to MaSS1VE when it
needs it.
Keep the path to the ROM through the app lifespan

This is a small step towards keeping a copy of the original ROM in the
user's app data
Remove file logging

It was half-arsed and will need to be redone as we can't assume we can
write to the same path as the executable
Remove a couple of unused consts

These two were not needed since moving to clsBinaryFile for reading the
ROM