fix line width in renderer

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add a button to hide annotations

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add button to hide sequencing depth

Resolves-bug: https://github.com/sebhtml/Ray-Cloud-Browser/issues/15
Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
move buttons a little bit

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
select region in the menu

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
perform readahead for every path

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>