Extend phone usage event types

[this-Aditya]

Introduces new phone usage event types to provide more detailed categorization of system and app events, minimizing the number of uncategorized (OTHER) events.
Resolves issue #484

[Hsankesara]

@this-Aditya would be good to document what all the events mean. Otherwise LGTM!! Thanks for working on it.

[Hsankesara]

Have you updated the schemas for android_app_usage_event?

[this-Aditya]

Yes the schemas are updated in pr: RADAR-base/RADAR-Schemas#411. I've documented new events in schemas. Should I add docs here as well?

[Hsankesara]

Yes the schemas are updated in pr: RADAR-base/RADAR-Schemas#411. I've documented new events in schemas. Should I add docs here as well?

No, I think that's okay. As long as it is documented somewhere.

[mpgxvii]

Btw @this-Aditya should this go to dev first?

[this-Aditya]

Yes, updated now.

[mpgxvii]

Yes, updated now.

@this-Aditya Thanks for this, but it can't seem to find the snapshot version. I'll make the release then.