Load font to use directly in ImGui components

[iWanheda]

Hey!

I can't load font between framestart and frameend, and I'm trying a theme that uses pushfont and popfont directly but I have no way of loading the font without either it being null or I crash because I can't load before something, it's really bugging me out.

Thanks!

[rokups]

Fonts may not be modified during lifetime of a frame. If you wish to switch a font, then do it after frame ended and before next one started.