Drag selection and screen by mouse
- Add 'Create selection for full-frame of 135 format film' button.
- Remove 'Undo Zoom' button, it is useless.
- Redesign 'Drag modes'.
Drag modes are now:
- Left button outside the selection: create a new selection.
- Left button on a border of selection: modify this selection.
- Left button inside the selection: move the selection.
- Middle button anywhere in the screen: move the screen (for Zoomed mode only).
Edited by Maksim Ushakov