Removes highlight strictlyEnforceRange setting from grid view.
modifies slide data structure and text parser
SlideData has separate members for font, font size and font unit.
Text parser and unit tests are updated accordingly.
Increases silde size in grid window.
Also, no support for text point size for now.
slide text position and background shading implemented
initial text scaling added prior to c++ revision
Slide font size is scaled relative to line length
If line length exceeds slide width, the line is scaled.
Updated unit tests.
Also no-markup implemented in slides.