Clean up sketch.h a bit more.

Author: ruevs

src/sketch.h

@@ -8,28 +8,12 @@
 #ifndef SOLVESPACE_SKETCH_H
 #define SOLVESPACE_SKETCH_H
 
-#include <cstdint>
-#include <string>
-#include <tuple>
-#include <unordered_map>
-#include <vector>
-
-#include "dsc.h"
-#include "param.h"
-#include "polygon.h"
-#include "platform/platform.h"
 #include "platform/gui.h"
-#include "srf/surface.h"
-#include "render/render.h"
 
 namespace SolveSpace {
 
 class hConstraint;
 
-class Expr;
-class ExprVector;
-class ExprQuaternion;
-
 enum class SolveResult : uint32_t;
 
 enum class PolyError : uint32_t {