Changes

Minor: Typo/Syntax in GLRendererQuirks

GLX: Put native ByteBuffer to native-order in 'glXGetVisualFromFBConfig' and minor edits (final, same 'nativeOrder()' call style)

GLJPanel: Use PixelBufferProvider AWTPixelBufferProviderInt; PixelBufferProvider: Add 'dispose()' to interface.

Transition reusing AWT specific PixelBufferProvider to allow a later user provided PixelBufferProvider.

Add TestGearsGLJPanelAWT, i.e. multiple JPanels w/ GLJPanel running GearsES2 in their own color.

Note: JComponent will introduce flickering if using opaque rendering mode!

GLBuffers: Extract common methods: bytesPerPixel(..) and componentCount(.). Better namings for vars, i.e. compCount, .. etc

Refactor: TextureData's PixelAttributes/PixelBufferProvider -> GLPixelBuffer/.. and enhance usage; GLJPanel: Use GLPixelBuffer* API and SingleAWTGLPixelBufferProvider if possible.

Refactor: TextureData's PixelAttributes/PixelBufferProvider -> GLPixelBuffer/.. and enhance usage
  - GLPixelBuffer, GLPixelAttributes and GLPixelBufferProvider have potential for wider audience,
    hence extract them to package 'com.jogamp.opengl.util'.

  - Using GLPixelBuffer, shall attempt to use pack/unpack row-stride, i.e.
    GL2GL3.GL_PACK_ROW_LENGTH, or GL2GL3.GL_UNPACK_ROW_LENGTH.
    See GLReadBufferUtil and GLJPanel

  - AWTGLPixelBuffer*: Attribute 'row-stride' allows reusing a bigger buffer than requested.

GLJPanel: Use GLPixelBuffer* API and SingleAWTGLPixelBufferProvider if possible.
  - Use GLPixelBuffer API to remove redundancies

  - Attempts to use SingleAWTGLPixelBufferProvider to save JVM/CPU heap space
    for BuffereImage and IntBbuffer (readBack)

Added unit new test demonstrating multiple overlapping GLJPanels reusing (or not)
a singlton SingleAWTGLPixelBufferProvider.

Fix regression of commit 0a7bf77b8c0765f8a53dc72a8edab8e0496938ff - GLReadBufferUtil's GLPixelBuffer* usage. Ref GLJPanel SingleAWTGLPixelBufferProvider's screenshots.

Ref GLJPanel SingleAWTGLPixelBufferProvider's screenshots:
  <http://jogamp.org/files/screenshots/gljpanels-singlebuffer/>

Fix NEWT MultiMonitor Regression: Use case w/o attached monitor, and NPE (Cache) in ScreenImpl.getVirtualMonitorDevice(..).

W/ RandR13, we can have a case of an Output/CRT w/o valid modes,
indicating a switched off or detached monitor.

ScreenImpl.getVirtualMonitorDevice(..) requires a Cache .. due to MonitorModeProps.streamInMonitorDevice(..)

Fix Bug 731: GLJPanel: Access global GLPixelBuffer via SingletonGLPixelBufferProvider, if provided - releasing prev. smaller GLPixelBuffer after resize.