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Since 4.4.2, any numeric value other than 0,
will disable kerning and add that value to current `letter-spacing`.

`letter-spacing` and `kerning` can be controlled from Rich Text editor now.
No GUI control for `word-spacing` though.

`fill` and `letter-spacing` are properly converted between Rich Document <-> SVG now.
Also fix indent.

Color picker and letter spacing were added earlier.
Kerning toggle was added in 4.4.2.

4.4.2 added default letter spacing option.

The image, I feel, might be work-in-progress, given the UI of
this feature seems in flux.

- Removed feature which were listed as deprecated since 3.0
- Also removed some unused image files

(cherry picked from commit a3ab2b0e)

- Move pre-installed plugins to a new page
- Clean up first paragraphs in Python plugins sections
- Put custom plugins in categories
- Move external tutorials on the bottom of the Resources page
- Add the Misc resources category below Python plugins
- Move Photobash plugin to Resources page
- Add a manual page about managing custom plugins
- Add might-not-be-safe disclaimer

(cherry picked from commit 4d6c20f245bc97d920bf0165018af1640738d168)

- document if()
- document ternary operator nesting
- document namespaced variables
- fix printf signature
- add sprintf

* Vector Libraries:
    - compositions templates
    - feather icons
* Templates: Storyboard