Entity: Add VecA and VecB, for vector memory on entities.

src/Entity.c

@@ -98,6 +98,8 @@ Entity Entity_New() {
 	e->C = 0;
 	e->D = 0;
 	e->E = 0;
+	vec2_set(e->VecA, 0.0f, 0.0f);
+	vec2_set(e->VecB, 0.0f, 0.0f);
 	e->child = NULL;
 
 	e->next = NULL;

src/Entity.h

@@ -72,6 +72,8 @@ struct TEntity {
 	int C;
 	int D;
 	int E;
+	vec2 VecA;
+	vec2 VecB;
 	Entity child;
 
 	float maxX, minX;