Multi-monitor improvements

This development effort is to identify and fix the major multi-monitor issues that currently exist in the Eclipse IDE. As multi-monitor becomes increasingly prevalent the multi-monitor errors in Eclipse Platform UI and SWT affect more and more users.

Consult the existing open bugs to start the identification:

• https://github.com/eclipse-platform/eclipse.platform.ui/issues?q=multi-monitor
• https://github.com/eclipse-platform/eclipse.platform.swt/issues?q=multi-monitor
• https://bugs.eclipse.org/bugs/buglist.cgi?order=Importance&product=Platform&query_format=advanced&resolution=---&short_desc=multi-monitor&short_desc_type=allwordssubstr