Add a new LaunchHandler to show error messages when starting applications

This LaunchHandler is only used when not running in headless mode. This
launchHandler is also responsible for showing the splash screen.

2011-03-30  Omair Majid  <[email protected]>

    * netx/net/sourceforge/jnlp/LaunchHandler.java
    (launchInitialized, launchStarting): New methods.
    * netx/net/sourceforge/jnlp/DefaultLaunchHandler.java
    (launchInitialized, launchStarting): New methods. No-op
    implementation.
    (printMessage): Make it static.
    * netx/net/sourceforge/jnlp/GuiLaunchHandler.java: New file.
    (launchCompleted, launchError, launchStarting, launchInitialized),
    (launchWarning, validationError): New methods.
    * netx/net/sourceforge/jnlp/Launcher.java (launchApplication):
    Invoke handler.launchInitialized and handler.launchStarting instead
    of showing a splash screen directly.
    * netx/net/sourceforge/jnlp/resources/Messages.properties: Add
    ButShowDetails, ButHideDetails and Error.
    * netx/net/sourceforge/jnlp/runtime/Boot.java (run): Do not exit on
    error.
    * netx/net/sourceforge/jnlp/runtime/JNLPRuntime.java
    (initialize): Set handler to GuiLaunchHandler if not running in
    headless mode.
    * netx/net/sourceforge/jnlp/util/BasicExceptionDialog.java: New
    file.
    (exceptionToString, show): New methods.

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