Make NewAbstractAaxlHandler publicly visible

[AaronGreenhouse]

Class org.osate.analysis.resource.budgets.handlers.NewAbstractAaxlHandler is currently package visible, and thus only usable internally to the org.osate.analysis.resource.budgets plug-in. This class is intended to replace the existing org.osate.ui.handlers.AbstractAaxlHandler in org.osate.ui. It needs to be moved to org.osate.ui and made public so that new analyses can use it.

Class should be renamed to something other than NewAbstractAaxlHandler, but I cannot used AbstractAaxlHandler because we are not ready to remove the existing AbstractAaxlHandler.

[AaronGreenhouse]

Renaming to AbstractAnalysisHandler.

[AaronGreenhouse]

This is being done in the context of creating a mixed trust scheduling analysis. This class may be further updated as needed to support this 2nd subclass, and to better abstract the capabilities of this class.

[AaronGreenhouse]

Also added addError() and addWarning() and addInfo() methods to ResultUtil