…ffice#1692)

…ffice#1692)

Fix PHPOffice#1692. Builds on work started some time ago by @0b10011, to whom primary credit is due.

Html Reader does not process the `head` section of the document, and, in particular, does not process its `style` section. It will, however, process inline styles, so 0b10011's model of adding the title as a text run (with styles) will work well once this change is applied. However, that model would not deal with the alternative method of assigning a Title Style, and just adding the title as text. In order to accommodate that, I have removed the declaration of heading font styles in the head section, and now generate them all inline in the body. This has the added benefit of being able to read the doc as html, then saving it as docx, preserving, at least in part, any user-defined font styles. Note that html does have pre-defined title styles, but docx does not.

@constip suggests in the original issue that margin top and bottom are being applied too frequently. I believe that was addressed by recently merged PR PHPOffice#2475. It is also suggested that the `*` css selector be dropped in favor of `body`. 2475 added the body selector. I agree that this renders the `*` selector unnecessary, and, as stated in the issue, it can cause problems. This PR drops that selector. It is also suggested that `loadHTML` be used instead of `loadXML`. This is not as easy a change as it seems, because loadHTML uses ISO-8859-1 charset rather than UTF-8, so I will not attempt that change.