AC-767 Removed FontUtil and updated fonts to Roboto

[rishabh-997]

Description of what I changed

1. Removed FontUtil.java
2. Refactored code where FontUtil.java was used
3. Updated XML files that were affected by FontUtil.java
4. Removed all Open-Sans.tff and replaced them with few Roboto.tff which might be called explicitly during UI update in future

Issue I worked on

JIRA Issue: https://issues.openmrs.org/browse/AC-767

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.

[codecov-commenter]

Codecov Report

Merging #745 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #745      +/-   ##
==========================================
+ Coverage   11.75%   11.83%   +0.08%     
==========================================
  Files         238      237       -1     
  Lines       10655    10576      -79     
  Branches     1028     1018      -10     
==========================================
  Hits         1252     1252              
+ Misses       9321     9242      -79     
  Partials       82       82              

Impacted Files	Coverage Δ
.../activities/activevisits/ActiveVisitsFragment.java	0.00% <ø> (ø)
.../activevisits/ActiveVisitsRecyclerViewAdapter.java	0.00% <ø> (ø)
...ditpatient/SimilarPatientsRecyclerViewAdapter.java	0.00% <ø> (ø)
...mobile/activities/dashboard/DashboardFragment.java	0.00% <ø> (ø)
...mobile/activities/dialog/CustomFragmentDialog.java	0.00% <ø> (ø)
...mentrypatientlist/FormEntryPatientListAdapter.java	0.00% <ø> (ø)
...entrypatientlist/FormEntryPatientListFragment.java	0.00% <ø> (ø)
...patients/LastViewedPatientRecyclerViewAdapter.java	0.00% <ø> (ø)
...openmrs/mobile/activities/login/LoginFragment.java	4.29% <ø> (+0.01%)	⬆️
...ies/matchingpatients/MatchingPatientsFragment.java	0.00% <ø> (ø)
... and 13 more

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[HerbertYiga]

@rishabh-997 thanks for working on this,you can also add a ticket ID on your commit message

[f4ww4z]

Looks good @rishabh-997 , see above comment next time.