Update version 1.0.7-dev
Fix crash using eyedropper above a (hidden) selection handle

We need to be in a Selection ink to start moving pixels from transform
handles.
Add NewFrameCommand::onGetFriendlyName() to differentiate "New Empty Frame" from "New Frame"
Fix several issues with keyboard shortcuts customization

Changes:
* Now default action modifiers can be removed (fix #521)
* Now action modifiers have a KeyContext (the key context depend on the
  action itself, cannot be configured by the user)
* Fix Accelerator::check() and Accelerator::operator=() when the unicode
  char and scancode are nil (i.e. we are comparing only modifiers)
* Convert Accelerators to a class to simplify code
* Remove unused variables in Accelerator::check() when REPORT_KEYS is
  defined
Avoid regenerating Document's extral cel when we're moving pixels (fix #522)

As PixelsMovement class uses the extra cel to show the pixels that we're
moving, we cannot show brush previews of quicktools (as the brush preview
uses/destroy/regenerate the same extra cel for its own purpose).