Feature/20 basic image edit

[leondeklerk]

Adds basic image editing:

• Interactive image view that allows: scaling, translating
  • Contains animations for different actions
  • Listeners for hooking other views to the behavior
• Edit view with a cropper and a drawing overlay
  • Cropper:
  • Draw crop box over the image
  • Translate the image when the box is moved to the side
  • Resize the crop box when the image is translated/scaled
  • Zoom in the image when the crop box is too small and enlarge the box
  • Aspect ratio support on the crop box
  • Zoom out the image when a crop box handler is held at the side of the image
  • Draw overlay:
  • Draw text over the image
  • Scale, edit, delete the text
  • Update the appearance of text
  • Draw over the image with pencil/marker/eraser types
  • Undo/redo actions
  • Reset the canvas
  • Save the edited image as a copy
  • Overwrite existing image with newly edited image
  • Cancel editing, or switching modes provides an unsaved changed warning if any changes where made
• Add the last modified date to the image data
• Improve caching of images in gallery and views
• Improve various other things related to styling/layout/text
• Update several dependencies

closes #20