8279641: Create manual JTReg tests for Swing accessibility

test/jdk/javax/accessibility/manual/ButtonDemo.html

test/jdk/javax/accessibility/manual/ButtonDemo.java

test/jdk/javax/accessibility/manual/ComboBoxDemo.html

test/jdk/javax/accessibility/manual/ComboBoxDemo.java

test/jdk/javax/accessibility/manual/DemoSelection.html

test/jdk/javax/accessibility/manual/DemoSelection.java

test/jdk/javax/accessibility/manual/OptionPaneDemo.html

test/jdk/javax/accessibility/manual/OptionPaneDemo.java

test/jdk/javax/accessibility/manual/README.md

test/jdk/javax/accessibility/manual/SwingSetTest.java

test/jdk/javax/accessibility/manual/TableDemo.html

test/jdk/javax/accessibility/manual/TableDemo.java

test/jdk/javax/accessibility/manual/TabsDemo.html

test/jdk/javax/accessibility/manual/TabsDemo.java

test/jdk/javax/accessibility/manual/TreeDemo.html

test/jdk/javax/accessibility/manual/TreeDemo.java

test/jdk/javax/accessibility/manual/lib/DescriptionPane.java

...jdk/javax/accessibility/manual/lib/FailureReasonPane.java

test/jdk/javax/accessibility/manual/lib/ManualTestFrame.java

test/jdk/javax/accessibility/manual/lib/PassFailPane.java