* add PaletteManager
* add hint for "external" palette-names
* macro utility, for local \import only
this tiddler is never meant to be tagged $:/tags/Macro
contains only a colour macro which allows to call `<<colour "...">>` within a tiddler and get the parameter-name instead of the resolved color
used in the PaletteManager to reveal the original color below the color that just uses its color with the colour macrocall
example:
```
\define get-real-index(string)
\import $:/core/macros/utils
<$wikify $name="result" text="""$string$"""> <- does the "colour" macrocall, but the one that returns the parameter name
<<result>>
</$wikify>
\end
<$set name="color" value={{{ [{$:/palette}getindex[color-of-interest]] }}}>
-> <<colour primary>>
<$wikify name="real-color-index" text="""<$macrocall $name="get-real-index" string=<<color>>/>""">
<<real-color-index>> -> primary
...
```
* transclude PaletteManager in snippets/paletteeditor
* transclude PaletteManager in core/ui/ControlPanel/Palette
* Update ControlPanel.multids
* add style for color inputs in PaletteManager
* Update PaletteManager.tid
* Update PaletteManager.tid
* add tooltips & aria-labels
* Update ControlPanel.multids
* Update PaletteManager.tid
* Update PaletteManager.tid
* Update PaletteManager.tid
* add escapecss filter
this filter would allow creating valid css classes from titles containing special characters
we assign a class to an element using `encodeuricomponent[]` so that the class name is encoded
in a stylesheet we create the classname by `<title>escapecss[]` which applies the uri encoding and escapes characters that need to be escaped
* Update encodings.js
* refactor tagToCssSelector, add escapeCssSelector
* use escapeCssSelector
* escape using CSS.escape if it's available
* Update encodings.js
* revert factoring out escapeCssSelector
... this makes the animation when inserting tiddlers / navigating to tiddlers in the pop storyview less jumpy
it simply sets `overflow-x` to `hidden` for the time of the insert-animation
Include = before each number in the Mathematics Operators examples,
so that people get used to seeing that in math examples where dupes
are likely.
Only the Mathematics Operators tiddler really needed to be changed;
the example tiddlers for individual operators were already using =.
Fixes#3979.
