#162 SWT Resource leaks patch

[Chabanois Cedric]

Here is a patch that removes resource leaks from SWTGraphics2D.
I use a pool of resources to dispose resources when SWTGraphics2D is disposed.

[Chabanois Cedric]

modified sources that correct swt resource leaks

[Chabanois Cedric]

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I used sleak (http://www.eclipse.org/articles/swt-design-2/sleak.htm) to detect leaks.

[Chabanois Cedric]

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I sent sources (only the modified ones) instead of a patch because I could not get latest sources from sourceforge (problem with sourceforge).

[Henry Proudhon]

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this went into the code a while ago.