SEGBITS FILE READER - Handle Whitespace
SEGBITS FILE READER - Handle Whitespace

The previous commit caused the segbits file reader test to fail as
trailing whitespace was removed from the test_data.  Updated the reader
to additionally handle a tag immediately followed by a newline.

Signed-off-by: Jake Mercer <df7fb6f8f6231c684421c49305804dd2ef1528c5@civica.co.uk>

SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray