Introduce genesis widget (#6961)

* Initial Commit

* Fix version number

* Fix docs date

editions/test/tiddlers/tests/data/genesis-widget/DollarSigns.tid

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+title: Genesis/DollarSigns
+description: Usage of genesis widget with attributes starting with dollar signs
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\whitespace trim
+<$genesis $type="$let" myvar="Kitten">(<$text text=<<myvar>>/>)</$genesis>
+<$genesis $type="$let" $$myvar="Kitten">(<$text text=<<$myvar>>/>)</$genesis>
++
+title: ExpectedResult
+
+<p>(Kitten)(Kitten)</p>

editions/test/tiddlers/tests/data/genesis-widget/MultipleAttributes.tid

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+title: Genesis/MultipleAttributes
+description: Usage of genesis widget with multiple attributes
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\whitespace trim
+<$genesis $type="$let" $names="myvar other" $values="Kitten Donkey" myvar={{{ Shark }}}>(<$text text=<<myvar>>/>|<$text text=<<other>>/>)</$genesis>
+<$genesis $type="$let" $names="$myvar $other" $values="Kitten Donkey" $$myvar="Shark">(<$text text=<<$myvar>>/>|<$text text=<<$other>>/>)</$genesis>
++
+title: ExpectedResult
+
+<p>(Kitten|Donkey)(Kitten|Donkey)</p>

editions/test/tiddlers/tests/data/genesis-widget/Simple.tid

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+title: Genesis/Simple
+description: Simple usage of genesis widget
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\whitespace trim
+<$genesis $type="div">Mouse</$genesis>
+<$genesis $type="div" class="tc-thing" label="Squeak">Mouse</$genesis>
++
+title: ExpectedResult
+
+<p><div>Mouse</div><div class="tc-thing" label="Squeak">Mouse</div></p>