Not a good idea to make asynchronous ROI excel export, back to previous
code.
* fixed refresh issues regression on layer panel.
* faster cancel operation of the search bar.
* minors changes on error handling in PluginClassLoader
minor improvement on ROI panel refresh.
fixed possible memory leak
* Simpler image resize operation (no more pixel size info).
* Processor: can choose to handle the exception in task with the
IcyHandlerException object.