Fixes part of #40 & #42: Highfi buttons part 1

[rt4914]

Explanation

Fixes part of #40
Fixes part of #42

This PR works on the highfi part of Return to Topic and Replay button. Both of these buttons appear only at the end of question/exploration player session and therefore they can never have a split view. Also, the top-margins are consistent across all combinations and therefore they have been defined only in values/dimens and not in any other dimens file.

Resources

Replay + Return to Topic Button

Exploration Mobile-Portrait
Exploration Mobile-Landscape
Exploration Tablet-Portrait
Exploration Tablet-Landscape

Question Mobile-Portrait
Question Mobile-Landscape
Question Tablet-Portrait
Question Tablet-Landscape

All other buttons (Next/Previous/Submit/Continue)

Exploration Mobile-Portrait
Exploration Mobile-Landscape
Exploration Tablet-Portrait
Exploration Tablet-Landscape

Question Mobile-Portrait
Question Mobile-Landscape
Question Tablet-Portrait
Question Tablet-Landscape

Split View Tablet-Portrait
Split View Tablet-Landscape

Buttons Specs

Screenshots

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Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The PR explanation includes the words "Fixes #bugnum: ..." (or "Fixes part of #bugnum" if the PR only partially fixes an issue).
• The PR follows the style guide.
• The PR does not contain any unnecessary auto-generated code from Android Studio.
• The PR is made from a branch that's not called "develop".
• The PR is made from a branch that is up-to-date with "develop".
• The PR's branch is based on "develop" and not on any other branch.
• The PR is assigned to an appropriate reviewer in both the Assignees and the Reviewers sections.

[rt4914]

@anandwana001 Check the last commit and 3109a12 and screenshot and that should suffice now.

Thanks.

[anandwana001]

LGTM, Thanks @rt4914