Rename _DESCRIPTION into DESCRIPTION
Added search and replace ui + modify translate_ui for python3
Fix panel drawing issues.
Manual connection to dirty changed and save triggered
Fix panel drawing issues
Added search and replace panel

The panel does not do anything yet, it was just to test if panels drawing was working properly
Added documentation about mode IDENTIFIER and DESCRIPTION
Refactor duplicate code in line number panel
Refactor the editor widget:
 - remove unneeded visibleBlocksChanged signal
 - make some panel update method private and provides a public method to refresh the list of panels
Fix bug when scrollbar visible?
Fix import error in example
Revert "Fix bug when scrollbar visible?"

This reverts commit e3e33d0bb74cce8da3d29fdc8f8db1fc41b14100.

I have to do more testing on different Desktop envirronement/ OS to know what to do with the scrollbars
close #36
Add missing license header
close #37
Add search and replace stylesheet
Add new colors to constants and add the panelHighlight style property
Fix bug with token from string: bool("False") does not return False
Hide whitespace by default
Fix issue with stylesheet