closes#11
Add an initial version of the text tool.
This commit adds:
- Basic text tool.
- On demand thickness and color update.
- Generalized logic for future widget based tools.
The core now has a method requestCapture, which receives a
CaptureRequest object with all the needed information.
This reduces code duplication in future features.
New improved selection code:
- Selection decopuled into a new class
- When you drag the selection against the limits it won't become
permanently smaller, it will "bounce" trying to recover its size.
If you drop it again it will adapt its size to the borders of the
screen.
- Fixed bugs in the button position algorithm.
- Implemented selection animations for future implementations.
The side panel opens with the Space key, this panel can contain
widgets to assist the capture with more features.
This commit fixes the preview of the tool hiding it when the
mouse hovers a widget. This is more needed now having a new widget
inside the CaptureWidget.
More flexible tool API
Minor code format fixes
Clipboard freeze fixed(?)
Arrow correcly growing close to the start point
Improve maintainability
Add undo/redo stack
