Asterisk markdown w/ trailing space - restore previous behavior

A trailing space previously 'escaped' using asterisks to bold. A leading space worked the same way. * text* would render as * text*, and *text * as *text *

This has been changed so that only a leading space works. *text * now displays as text

This is a breaking change, significantly changes the display of message history, and should be reverted in both the PC and web clients.