[Feature Request] Allow user to paste image from clipboard

[raindropsfromsky]

Is your feature request related to a problem? Please describe.
ScreenToGif is primarily designed to capture the screen and then edit the resultant frames.
But often we need to explain the point with an image/sketch, etc.
ScreenToGif it is not very strong in composing such collage.

For example, it does not allow us to paste image from clipboard in a frame.

Describe the solution you'd like
Allow the user to paste an image from clipboard in the current frame or selected frames.

He should be able to manipulate it using its handles:

• scale it up/down
• Rotate it
• Move it to any part of the frame.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.