Set xelatex interaction to nonstopmode
Change text parsing mechanism

Support different operations for text blocks.
Rename files, change example
Improve preprocess metadata handling

Start using metadata in tex generator.
Fix metadata indices handling

When adding metadata element to the same line,
don't forget to update start/end indices for
present metadata elements. Update is necessary
since line substring could have changed.
Implement inverted colors

TODO: rework verbatim handling.
Use verb, fix inverted colors
Add support for underlined fragments
Support for large font, flaps and AC

Increased left and right margins to fit large 'FLAPS ..'.
Reduce output line lenght
Fix ops example