Central Zoom and Pan Feature

[princ09]

Bug Report or Feature Request (mark with an x)

- [ ] Regression (a behavior that used to work and stopped working in a new release)
- [ ] Bug report -> please search issues before submitting
- [x] Feature request
- [ ] Documentation issue or request

when zoomed, pdf zoom from top left corner but what I need/required is a zoom from central. also want users to move around(pan) the pdf instead of scrolling it.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Helias]

implemented in #1199