Add dropCap to paragraph style.
Docx reader: Use dropcap state.

If we get to a dropcap, we keep hold the inlines until the next
paragraph, and combine it there.
Docx: Add dropcap tests.
Docx reader: combine inlines properly in dropcaps.

Make sure that adjacent inlines are combined properly in dropcaps. This
updates the test results as well.
Merge pull request #1522 from jkr/dropCap

Drop cap