Add/refactor PaletteManager (#3832)

* 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

core/ui/ControlPanel/Palette.tid

@@ -15,7 +15,7 @@ caption: {{$:/language/ControlPanel/Palette/Caption}}
 <$reveal type="match" state="$:/state/ShowPaletteEditor" text="yes">
 
 <$button set="$:/state/ShowPaletteEditor" setTo="no"><<lingo HideEditor/Caption>></$button>
-{{$:/snippets/paletteeditor}}
+{{$:/PaletteManager}}
 
 </$reveal>