Allow for multiple StroopMainForm instances

[FramePerfection]

The StroopMainForm class currently expects several links to static state, such as SavedSettingsConfig, to manage the state of the single instance that exists. However, it may be desirable to display multiple StroopMainForm instances at once.
This yields the following implications (list is yet to be completed):

• The tab visibility and order must be saved per instance, implying some sort of mechanism to identify different StroopMainForm instances within the user's preferences (previously in the Config/SavedSettings.xml file)
• Actions on Config.Stream (such as running, attaching to a different process or disposing of it) must not be tied directly to Form events
• Make some WatchVariableUtilities.baseAddressGetters depend on the StroopMainForm instance

[FramePerfection]

This should be addressed and reconsidered in another issue following the Infrastructure Issue template.

[FramePerfection]

I'll reconsider what to do about this once #27 is closed.