AC-1034: Migrate patientdashboard package from MVP to MVVM architecture

[amrsalah3]

Description of what I changed

I've migrated patientdashboard package from MVP to MVVM architecture and fixed some bugs in this package and its fragments:
This package contains base classes and 6 sub-packages:

1. details
2. allergy
3. visits
4. diagnosis
5. vitals
6. charts

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-1034

Checklist: I completed these to help reviewers :)

• My pull request only contains ONE single commit
  (the number above, next to the 'Commits' tab is 1).

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

• All new and existing tests passed.

• My pull request is based on the latest changes of the master branch.