Added improved non-clay text handling along with consistent origin and rotation API

draw/pipeline_2d_base.odin

@@ -103,7 +103,8 @@ Primitive :: struct {
 	bounds:     [4]f32, //  0: min_x, min_y, max_x, max_y (world-space, pre-DPI)
 	color:      Color, // 16: u8x4, unpacked in shader via unpackUnorm4x8
 	kind_flags: u32, // 20: (kind as u32) | (flags as u32 << 8)
-	_pad:       [2]f32, // 24: alignment to vec4 boundary
+	rotation:   f32, // 24: shader self-rotation in radians (used by RRect, Ellipse)
+	_pad:       f32, // 28: alignment to vec4 boundary
 	params:     Shape_Params, // 32: two vec4s of shape params
 }