Fix compile error in MacPluginEventInspector

The class DynamicStorageItem does not exist. Most probably
it is a typo and DefaultStorageItem was needed.
Upgrade to Nexus 2.7.0
Fix possible NPEs in indexer
File formatting
Rewrite event inspector for new events system
Overhaul pom
Store new files on update if no files can be found
Migrate to new capabilities system (and NPE fix)