Add ctrl+shift+t for reopen closed tab
Add debug shortcuts mimicking Chrome Dev Tools
Added
* (ctrl shift t) Reopen closed tab
* (F8) Resume
* (F10) Step Over
* (F11) Step Into
* (shift F11) Step Out

Removed
* Show Image Thumbnails (ctrl shift t)
* Toggle bookmark (f11)
* Show bookmarks (shift f11)
* Force step over (alt shift f8)
* step out (shift f8)
Merge pull request #5 from b2io/debug-shortcuts

Debug shortcuts