Added docs and project management tool update

doc/files/opencanvas3d.txt

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+#title OpenCanvas3D [RCBasic Doc]
+#header function OpenCanvas3D( viewport_x, viewport_y, viewport_w, viewport_h, mode)
+
+Returns a 3D Canvas for viewing the scene.
+
+Returns -1 if canvas could not be created.
+
+Note: Each 3D canvas has its own camera so you need to make sure you have the canvas active before doing anything with the camera
+
+Note: 2D drawing commands do not work on 3D canvases. You need to open a 2D canvas for drawing images.
+
+#ref OpenCanvas OpenCanvasSpriteLayer