Various changes and improvements

Changed editable header to icon only
Changed topic navigator title to include topic count
Removed links from topic and post metadata
Reduced font size of post meta and right-aligned text
Fixed tooltip markup and CSS
Corrected some jsdoc params
Adjusted FlowHandlebars and FlowHistoryStateManager to use better class structure
Added math Handlebars helper function
Added .mw-ui-buttonspacer
Removed padding when .mw-ui-quiet and .mw-ui-thin simultaneously (hack, to be removed)
Increased topic spacing by .5em, topic meta by .33em
Added post author styling to give more visibility to author name