Add permissions attribute to route extension points & check permissions property of services

[pvlasov]

Add permissions optional string attribute. Permissions expression shall support & (and) | (or) and grouping with parenthesis. One option is to create a simple ANTLR 4 grammar. ExtensionManager.RouteEntry constructor shall take additional "permissions" parameter and route entry's match() shall take AuthorizationProvider as a parameter and take permissions into account during matching.

Route services shall achieve the same functionality through permissions property.