add support for resource name pattern

[anb0s]

For some tools (run in bash etc.) we need a way to provide a name pattern (name and file extension ?).

A command can define such pattern (regex)

• do not show the menu if selection does not fit

related to #70

[anb0s]

found some info about needed tester:

https://wiki.eclipse.org/Command_Core_Expressions#Property_Testers

https://git.eclipse.org/c/platform/eclipse.platform.resources.git/tree/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/propertytester/ResourcePropertyTester.java