Fixed problem with HTML inline parse rule

We were incorrectly eating line breaks after self-closing inline HTML
tags
Added reveal macro
Improvements to reveal widget popup handling
Refactored widgets not to use a base class
Add a better error message for unknown widgets
Refactored widget renderers to be hosted within HTML element renderers

This arrangement takes better advantage of the similarities between the
now deleted widget renderer and the element renderer. It also obviates
the need for wrapper elements around every widget.
Docs update
Make modal wizards work again
Fixed problem with tag dropdown list being inline rather than block
Refactor things so that widgets can opt not to generate an element

They have to have a single child renderer instead
Get rid of the extraneous <span> around link widgets
Improve tag template

We have to include fake <li> tags to keep Bootstrap's specificity rules
happy
Fixed bug with refreshing transclude widget
Removed extraneous <p> tag from tag dropdown

…by making the <li> element be in block mode
Fixed missing parameter
Added setstyle widget and use it to colour the tag buttons
Improved the ViewTemplate

Including bringing back the SVG close icon
Added version widget
Add error message when trying to dump a non-existent tiddler
Simplify the page template by getting rid of the nav bar