AST + runtime memoizer

[Mzack9999]

Closes #345

[tarunKoyalwar]

lgtm !

seems like it might create empty variable blocks sometimes

var ()

func Test(a string, b string) string {

	h := hash("Test", a, b)
	v, _, _ := cache.Do(h, func() (interface{}, error) {

		vresultTest := &resultTest{}
		vresultTest.result0 = tests.Test(a, b)
		return vresultTest, nil

	})

	vresultTest := v.(*resultTest)

	return vresultTest.result0

}

but i believe it was never intended to be fully automated as memoized functions need to be replaced manually in existing code