Update copyright year to include 2019

Fix JDK8 javadoc lint errors

Issue 261 ; applying patch from jlessner@

Issue 260 ; applying patch from jlessner@

refactoring jdk16 and jdk16-modules back into core and examples respectfully, additional fixes to extras package, enable OSX intel profile by default

Issue 235 - PSwingEventHandler now uses Point2D.Double in call to cameraToLocal to avoid under/overflow

- small javadoc change to fix javadoc warnings

Issue 217; adding/replacing license headers

Issue 173; merged from branch; added @param and @since to PSwing.setUseBufferedPainting; added unit test to cover buffered painting branch in PSwing.

Issue 173; (merge from branch) Introduced useBufferedPainting option to PSwing. Used much of the original buffered painting implementation details from Piccolo2D 1.2. Also added PSwingExample4 which extends PSwingExample1 but turns on buffered painting for all of the PSwing nodes.

Issue 205 ; updating copyright year in license header to 2011

Applied fixes from the piccolo 1.3 branch to trunk, see issue 163

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

Issue 37 ; refactoring package edu.umd.cs.piccolo to org.piccolo2d in core

Issue 177 ; adding additional unit tests and applying patch

Marking accessor for PNotificationCenter Singleton as synchronized. This one was caught by poster in http://code.google.com/p/piccolo2d/issues/detail?id=136#c4

Removing Deprecated code

Fixing Issue 136. PNotificationCenter is being made final so that subclasses can't create multiple instances of it

Changing constants to final as per Issue #135

Issue 163: restore component.revalidate call in constructor to get us back to state of PSwing r965

Issue 163: Removed infinite loop introduced in r978 by calling component.revalidate in PSwing.updateBounds. With the removal of HeirarchyBoundsListener in r978, this should put PSwing back to r965, the state it was in before we started working on this issue.

Fixes issue 163. ...

- Removed the HiercharyBoundsListener that was added in r973, it was not totally effective, and it's not clear why it was partially effective.
- Added component.revalidate to updateBounds, so that bounds are computed based on correct component size.
- Removed redundant call to component.revalidate in constructor, since the constructor calls updateBounds.

Fix for Issue 163 changes in size of node itself were being detected, but not changes in the size of its progeny. ...

I'm not entirely sure why a method called "ancestorResized" gets called when a subcomponent changes... but I'm not going to complain. Just works.

Fixed Issue # 160 ...

Removing component listener from PSwing constructor. Caused more problems than it solved.

Made PSwing.setVisible lazily call its component's setVisible method depending on its current visibility. This should stop the stack overflow being experienced by Chris Malley. Since I have been unable to reproduce it, I can't test it.

Fixing Issue 158 - With event handlers not being installed properly for nodes after they get removed and then re added to a Scene.

updating copyright years to include 2010

Unnecessary import.

Modifying SwingLayoutNode so that it accepts a Container during construction. Otherwise, creating a node that uses BoxLayout is impossible without making the node's layout mutable.

Removing setLayout method. Effectively making the layout final.