Introduce an improved but temporary cache invalidation method for palettes

editions/test/tiddlers/tests/data/palettes/Accumulate.tid

@@ -0,0 +1,40 @@
+
+title: Operators/Palettes/Accumulate
+description: Recursively accumulate palette definitions
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\import [subfilter{$:/core/config/GlobalImportFilter}]
+\parsermode inline
+<$text text={{{ [accumulate-palette-entries[MyPalette]] }}}/>
++
+title: $:/palette
+
+MyPalette
++
+title: MyPalette
+name: My Palette
+description: My custom palette
+tags: $:/tags/Palette
+type: application/x-tiddler-dictionary
+palette-import: MyOtherPalette
+color-scheme: light
+
+page-background: <<colour custom>>
+custom: #f4e4d4
++
+title: MyOtherPalette
+name: My Other Palette
+description: My other custom palette
+tags: $:/tags/Palette
+type: application/x-tiddler-dictionary
+color-scheme: light
+
+page-background: #d4e4f4
+background: red
++
+title: ExpectedResult
+
+["page-background:#d4e4f4","background:red","page-background:&lt;&lt;colour custom&gt;&gt;","custom:#f4e4d4"]{"title":"MyPalette","name":"My Palette","description":"My custom palette","tags":"$:/tags/Palette","type":"application/x-tiddler-dictionary","palette-import":"MyOtherPalette","color-scheme":"light","text":"page-background: &lt;&lt;colour custom&gt;&gt;\ncustom: #f4e4d4"}

editions/test/tiddlers/tests/data/palettes/BasicLookup.tid

@@ -1,6 +1,6 @@
 
 title: Operators/Palettes/BasicLookup
-description: Compute the 
+description: Basic palette lookups
 type: text/vnd.tiddlywiki-multiple
 tags: [[$:/tags/wiki-test-spec]]