<hr />

Class name does not conform to our coding style, but <HR> or <Hr>...
Use <hr />
<hr> in python code (mpmenu)
Merge branch 'hr'

Conflicts:
	content/gui/xml/mainmenu/credits.xml
	content/gui/xml/mainmenu/multiplayer/multiplayermenu.xml
	development/generate_credits.py

This updates the credits generation script to use <hr />.