Support builtin modules/transforms

[Michael-F-Bryan]

It'd be really nice if the interpreter supported most of the builtin modules and transforms from the cheatsheet.

2D shapes:

• circle(radius | d=diameter)
• square(size, centre)
• square([width, height], centre)
• polygon([points...])
• polygon([points...], [path...])
• text(t, size, font, halign, valign, spacing, direction, language, script)

3D shapes:

• sphere(radius)
• sphere(d = diameter)
• cube(size, center)
• cylinder(h, r|d, center)
• cylinder(h, r1|d1, r2|d2, center)
• polyhedron([points...], [faces...], convexivity)
• linear_extrude(height, center, convexivity, twist, slices)
• rotate_extrude(angle, convexivity)

Transformations:

• translate([x, y, z])
• rotate([x, y, z])
• rotate(a, [x, y, z])
• scale([x, y, z])
• resize([x, y, z], auto, convexivity)
• mirror([x, y, z])
• multmatrix(m)
• color("colorname", alpha)
• color("#hexvalue")
• color([r, g, b, a])
• offset(r|delta, chamfer)
• hull()
• minkowski()

Boolean operators:

• union()
• difference()
• intersection()

Math functions:

• abs()
• sign()
• sin()
• cos()
• tan()
• acos()
• asin()
• atan()
• atan2()
• floor()
• round()
• ceil()
• ln()
• len()
• let() (contextual keyword?)
• log()
• pow()
• sqrt()
• exp()
• rands()
• min()
• max()
• norm()
• cross()