Issue title: Watermark font
 Issue body: How to change watermark font??
 Comments: 
 Comment 0: I need to change menu font. Do you know how can i do?
 Comment 1: I think just replace font path in gui.cpp
 Comment 2: Please someone help
 Comment 3: create font 
 Comment 4: What do you mean create font
 Comment 5: use vgui_spew_fonts to look for a builtin font. when you choose one go to SDK/Surface.h and replace font value. 
 Comment 6: ISurface has a virtual function called `CreateFont`, returning an unsigned int as an id.
ISurface then uses this ID in another vfunc called `SetFontGlyphSet`, assigning it to a windows font.
find where the equivilent of `SetFontGlyphSet` is getting called and change the font name to what you want.
{'source': 'GithubIssues', 'repo_name_with_owner': 'danielkrupinski/Osiris', 'issue_id': 578755464, 'repo_stars': 2889.0}