Add dropdown interface for setting the type of a tiddler

core/docs/types/image_gif.tid

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+title: $:/docs/types/image/gif
+description: GIF image
+name: image/gif

core/docs/types/image_jpeg.tid

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+title: $:/docs/types/image/jpeg
+description: JPEG image
+name: image/jpeg

core/docs/types/image_png.tid

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+title: $:/docs/types/image/png
+description: PNG image
+name: image/png

core/docs/types/text_plain.tid

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+title: $:/docs/types/text/plain
+description: Plain text
+name: text/plain

core/docs/types/text_vnd.tiddlywiki.tid

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+title: $:/docs/types/text/vnd.tiddlywiki
+description: TW5 wikitext
+name: text/vnd.tiddlywiki

core/ui/EditTemplate/type.tid

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+title: $:/core/ui/EditTemplate/type
+tags: $:/tags/EditTemplate
+
+<p>//Type:// <$edit-text field="type" tag="input" default="" placeholder="type" focusPopup=<<qualify "$:/state/typeDropdown">> class="tw-edit-typeeditor"/> <$button popup=<<qualify "$:/state/typeDropdown">> class="btn-invisible btn-dropdown">{{$:/core/images/down-arrow}}</$button></p>
+
+<div class="tw-block-dropdown-wrapper">
+<$reveal state=<<qualify "$:/state/typeDropdown">> type="nomatch" text="" default="">
+<div class="tw-block-dropdown tw-edit-type-dropdown">
+<$linkcatcher to="!!type">
+<$list filter="[is[shadow]prefix[$:/docs/types/]] [!is[shadow]prefix[$:/docs/types/]] +[sort[description]]"><$link to={{!!name}}><$view field="description"/> (<$view field="name"/>)</$link>
+</$list>
+</$linkcatcher>
+</div>
+</$reveal>
+</div>

plugins/tiddlywiki/markdown/docs_type_markdown.tid

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+title: $:/docs/types/text/x-markdown
+description: Markdown
+name: text/x-markdown