Add multiline editing feature.
- Multiline Editing
- Keyboard interactions are inspired from QtCreator.
- Alt+Shift+[up or down] to edit upper or lower lines.
- Move editing cursors through: Ctrl+(up, down, left, right, end, home)
- Feature and unit test.
There are probably some unmanaged cases about selection, tabulation… but it is a good base. It may not be a good idea to merge it in master directly.
Edited by Renaud Guezennec