Issue #461: Add a keyboard shortcut for getting pure 45, 90, 135, 180, 225, 270, 315 and 0 degree angles for all tools. (dismine/valentina)

New issue 461: Add a keyboard shortcut for getting pure 45, 90, 135, 180, 225, 270, 315 and 0 degree angles for all tools. https://bitbucket.org/valentinateam/valentina/issues/461/add-a-keyboard-shortcut-for-getting-pure

Roman Telezhinskyi:

Add a keyboard shortcut for getting pure 45, 90, 135, 180, 225, 270, 315 and 0 degree angles for all tools, including the control handles when creating curves.