Update copyright year to include 2019

Fix JDK8 javadoc lint errors

Issue 189 ; adding transparency support for SWTGraphics2D and PSWTPath

Issue 205 ; updating copyright year in license header to 2011

Issue 187 ; applying patch from berthold.daum at bdaum.de, adding example that demonstrates issue

Issue 37 ; refactoring example packages to org.piccolo2d.examples and org.piccolo2d.extras.swt.examples for examples and swt-examples respectively

Issue 37 ; refactoring package edu.umd.cs.piccolox.swt to org.piccolo2d.extras.swt in swt

updating copyright years to include 2010

Making SWTGraphics2D not use internal .height field since isn't technically part of its public API; As per Issue 125. ...

Also, re-enabled the disabling of double buffering in the SWTBasicExample.

Adding clone tests to allow for later refactoring.

Cleaning in PSWTText code a little.

Applying patches in fixing Issue #70 by applying patches found in the issue. I also updated the Basic SWT example so that it show the text's background color in use. Thank you dimwethion for submitting the initial patch.

minor style, doc fixes

Issue 132 ; fixing package names and removing Temp class

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 8 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 7 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 6 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 4 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 3 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 2 of several

Issue 132 ; refactoring SWT examples from examples module to new swt-examples module, commit 1 of several