Release 1.03.65.html5-css.176

Development release of the HTML 5 branch, which allows layout using different styles using CSS.

• New html5 transformation uses different CSS styles to control rendering.
• CSS styles can be controlled by adding different variants on top of the main style - RISC OS 2 style, or with different fonts, etc.

Changes since 1.03.65.html5-css.105:

• Added: New input element for key and mouse input.
• Added: New actionbutton element for user interface buttons.
• Added: New definition-table element for textual definitions.
• Added: &ellipsis; entity.
• Changed: data-size attribute on offset and message elements.
• Changed: state attribute on offset and message elements for reserved and undefined data.
• Changed: vector-definition can now report its mode as being IRQ.
• Changed: filename element now has a type attribute for the format of the filename.
• Changed: chapter can now describe the documentation group it belongs to.
• Changed: reference can now refer to a chapter as well as inline elements.
• Changed: HTML 5 indexed document generation can now pass through document groups and part numbers to the edge index and footers.
• Changed: HTML 5 indexed documents now pass through chapters numbers.
• Changed: HTML 5 indexed interfaces are now laid out better and can include descriptions, and references in the page header.
• Fixed: system-output is now an inline element, rather than block.
• Fixed: bit elements no longer repeat names when states are supplied.
• Fixed: HTML 5 transform lays out use blocks better in PDFs (no longer forces a new page).
• Fixed: HTML 5 transform generates bookmarks in the PDF much better.
• Fixed: HTML 5 transform forces chapters on to right pages.
• Fixed: HTML 5 transform no longer forces breaks when prose pargraphs are used before definition blocks.