Revert "Reindent code. Remove trailing white space"

This reverts commit 9f7681a1ce6123fa12451b056e146541503f9e19.
Revert "Adding zoom factor to textblock location, fontsize, and margin width calculation to gracefully handle zooming of text"

This reverts commit c755672d1d426f10d6db597bd05bcbae70728839.
Always display RLN to the right of the normal line numbers
Redraw RLN upon code region being collapsed or expanded
Replace preview image
Bump revision number