Add TextStruct class
add folding information
Structure is displayed in the statusBar.
Translation
better parenthesis and brace matching
add antialiasing
bugfixes
Merge branch 'text-struct' of https://github.com/Bramas/texiteasy into text-struct
root environment (containing the entire document) is not foldable
left right matching + math environment + comment environment
dollars are closed properly + other bug fixes