Added docs and project management tool update

doc/bu/files/clonecanvas.txt

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+#title CloneCanvas [RCBasic Doc]
+#header function CloneCanvas(c_num, mode)
+
+Returns a clone of a canvas. Clone canvases are mirrors of the original canvas so when you draw to one it will also be on the other. This is useful for a splitscreen 2d game.
+
+Mode is a canvas render mode like the one passed to OpenCanvas()
+
+
+#ref OpenCanvas