This PR adds two options to control scrollwheel behavior.

* `scrollwheel_lines`: How many lines to scroll.
* `scrollwheel_zoom_disable`: To disable zooming by control + scrollwheel.

Control of vertical scrolling is taken away from Scintilla to provide 
consistent behavior when the control key is or is not pressed.  Lines option 
added because I don't see a way to get or set the value used by Scintilla.

Supersedes #2954 
You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany/pull/3835

-- Commit Summary --

  * Add option to block scroll-wheel zooming
  * Add option to change number of scroll lines

-- File Changes --

    M doc/geany.txt (3)
    M src/editor.c (18)
    M src/editor.h (2)
    M src/keyfile.c (4)
    M src/sciwrappers.c (6)
    M src/sciwrappers.h (1)

-- Patch Links --

https://github.com/geany/geany/pull/3835.patch
https://github.com/geany/geany/pull/3835.diff

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