Updated docs and added constants to tracker

doc/files/savebmp.txt

@@ -0,0 +1,34 @@
+#title SaveBMP [RCBasic Doc]
+#header Function SaveBMP(img, file$)
+
+Save an image to a *.bmp file
+
+#code
+title$ = "Sprite Test"
+w = 640
+h = 480
+fullscreen = FALSE
+vsync = FALSE
+
+OpenWindow( title$, w, h, fullscreen, vsync )
+
+my_canvas = OpenCanvas(w, h, 0, 0, w, h, 1)
+
+Canvas(my_canvas)
+
+SetColor(RGB(255,0, 0))
+CircleFill(50, 50, 25)
+
+SetColor(RGB(0, 255, 0))
+CircleFill(590, 50, 25)
+
+SetColor(RGB(0, 0, 255))
+CircleFill(590, 430, 25)
+
+img = CanvasClip(0, 0, 640, 480)
+SaveBMP(img, "test.bmp")
+
+Update()
+WaitKey()
+#/code
+