Added new functions to documentation

doc/files/getspriteshape.txt

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+#title GetSpriteShape [RCBasic Doc]
+#header Function GetSpriteShape(spr_id)
+
+Returns the shape of a sprite.
+
+Possible Shapes
+#list ul
+#li SPRITE_SHAPE_NONE
+#li SPRITE_SHAPE_BOX - A rectangular shape
+#li SPRITE_SHAPE_POLYGON - A polygon (any shape with 3 or more sides)
+#li SPRITE_SHAPE_CIRCLE - A circle
+#li SPRITE_SHAPE_CHAIN - A open polygon shape
+#list ul
+#li NOTE: Mainly used for terrain
+#/list
+#/list
+
+#ref SetSpriteShape