Rework load progress dialog

[pjonsson]

This uses the Java builtin ProgressMonitor class. As an additional bonus, this makes the cancel button work.

[pjonsson]

@nfi after the latest changes, this should work better since the AWT thread isn't as contended as before.

[nfi]

Looks better. There are no longer any problems interacting with the progress dialog under macOS. Some things I noticed:

1. If a simulation fails to load and I close the error message dialog - the progress dialog remains open and idle. And another progress dialog opens if I load the simulation again.
2. If I cancel loading a simulation and reload the simulation, I often end up with multiple instances of the plugins. It seems the old simulation sometimes is not completely removed before the new simulation is set up. I am not sure if this issue is noticeable now due to the cancel button working better or something else, but I did not manage to reproduce this in the master. And it does not seem to happen if I wait a little before reloading the simulation, so I suspect a race condition somewhere.

[pjonsson]

The first issue is fixed, was missing a setProgress when restarting/cancelling.

The second issue is hard to reproduce, even when I limit my CPU to 1700 MHz. I fixed the issue I found.

[pjonsson]

The last revision worked, but I think the commit history had some rebase-leftovers. Fixed that, and everything should work in this revision.

[nfi]

A note with empty string takes no space and ProgressMonitor does not revalidate if a note is added later. Add an initial note to reserve space for notes in the dialog. Otherwise the 'Cancel' button is truncated in some UI such as Flatlaf.

Suggested change

	progressMonitor = new ProgressMonitor(frame, progressTitle, "", 0, 6);
	progressMonitor = new ProgressMonitor(frame, progressTitle, "Preparing to load simulation", 0, 6);

[nfi]

Perhaps set a better title on the progress monitor? Otherwise the title in, for example, a Swedish system will be 'Pågår'.

Suggested change

	final String progressTitle = "Loading " + (configFile == null ? cooja.getSimulation().getCfg().file() : configFile.getAbsolutePath());
	final String progressTitle = "Loading " + (configFile == null ? cooja.getSimulation().getCfg().file() : configFile.getAbsolutePath());
	final String defaultTitle = UIManager.getString("ProgressMonitor.progressText");
	UIManager.put("ProgressMonitor.progressText", "Loading simulation");

[nfi]

The max progress includes any deprecated plugins. Not that it will make a noticeable difference, but should there not be a Cooja.tickProgress(); before line 360 to count skipped plugins?

[nfi]

Restore original title for ProgressMonitor if it was changed earlier.

Suggested change

	progressMonitor.setProgress(0);
	progressMonitor.setProgress(0);
	UIManager.put("ProgressMonitor.progressText", defaultTitle);