Add Vulkan renderer

[cwervo]

Instead of blitting shapes to the linuxframebuffer, have a Vulkan renderer that displays things as 2D SDFs (would need a font atlas for rendering text then I guess?)

Can expand an play/Display_vk.tcl

[osnr]

We already basically use a font atlas anyway (font.tcl). Could also have SDF-native font(s) where each glyph is a function

Main reason to do this is so we can rotate images & text