Make sure org-mode can display inline images even if `openwith-mode` is
turned on.
Use built-in `zap-up-to-char` command (from misc.el) instead of advising
`zap-to-char`.
Start using change-inner and expand-region.

- https://github.com/magnars/change-inner.el
- https://github.com/magnars/expand-region.el
Start using multiple-cursors.

https://github.com/magnars/multiple-cursors.el
Add org-mode package archive (contains org-plus-contrib).