Graphics function for drawing arcs

[mateoconlechuga]

The below functions should be implemented

gfx_Arc(<tbd>);
gfx_FillArc(<tbd>);
gfx_Arc_NoClip(<tbd>);
gfx_FillArc_NoClip(<tbd>);

[randomguy70]

well?

[adriweb]

well?

@randomguy70 : in the process of being implemented/reviewed in #365

[mateoconlechuga]

Ellipse routines merged with #365

[adriweb]

A source of inspiration for parameters: https://wiki.inspired-lua.org/gc:drawArc