Update MMDrawer and MMPage API

[PeterPetrik]

• Define bottom margin for Page and Drawer
• Fix Android back button on Drawer

Previous description:

Questions @tomasMizera
A/ DRAWERS
1/ Shouldn't we define bottom margin? on most screen is 8 I believe (?), and then the content do not need to be offsetted from bottom in caller?
2/ I believe for drawers the top spacing is usually 20 (on pages 40, but drawers I think 20?)
3/ Shouldn't we introduce android back button for drawers too?

Q: for Pages, don't we want bottom margin too?
Q: for drawer - the android back button should be bound to close() signal?

[github-actions]

Pull Request Test Coverage Report for Build 8141725568

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 60.089%

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Files with Coverage Reduction	New Missed Lines	%
input/core/merginuserinfo.cpp	3	72.99%

Totals
Change from base Build 8141182413:	-0.02%
Covered Lines:	7549
Relevant Lines:	12563

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💛 - Coveralls