feat: add the ability to draw strings, support kerning, line height...

assets: add oswald font

feat: add rasterizer fill

feat(core): correct quicksort, and add max/min with 3 parameters

feat: add basic line rasterizer

feat(vec): add qsort for vectors and insert_sorted

doc: update readme file

feat: add font loading and contouring

feat: fix shared ptr being maybe incorrectly destroyed when 2 different

feat: add shape and rasterization of line (just line not filled shapes)

meta: add stb true type dependency

refacor: added Vec2 class, use start+end for Rect and add a GfxContext

fix: avoid scheduling cpus that are already scheduled

feat(gfx): add draw_rect to opengl+raster backend

feat(gfx): add a basic graphic library with support for an SDL backend