added __repr__ to Color and removed __str__.

Author: pokepetter

ursina/color.py

@@ -14,7 +14,7 @@ class Color(Vec4):
     def __init__(self,*p):
         super().__init__(*p)
 
-    def __str__(self):
+    def __repr__(self):
         return f'Color({self[0]}, {self[1]}, {self[2]}, {self[3]})'
 
     @property