Render fixity information

Affects functions, type synonyms, type families, class names, data type
names, constructors, data families, associated TFs/DFs, type synonyms,
pattern synonyms and everything else I could think of.
Reorder topDeclElem to move the source/wiki links to the top

They appear in the same position due to the float: right attribute but
now they're always at the top of the box instead of at the bottom.