Merge branch 'sev/hud_font_weights' into 'master'

Adjust font weight for some of the HUD text

This merge request accompanies xonotic/xonotic!11

The new version of the Xolonium fonts features a bolder bold version.
This causes some of the text to become too dense.
Therefore, this branch makes the following changes:

Bold to Regular:

- Scoreboard column titles
- Weapon panel binds/numbers/names
(These are not very important, hence bold is not crucial anyway.)
- Race panel auxiliary info
(The running time is important, hence it remains bold.
The checkpoint delta and penalty is a lot smaller and not bold anymore.)

Regular to Bold:

- Health/Armor panel numbers
(Arguably the most important text on screen, hence they should be bold.)

See merge request !144