Add editBoundaryMode on DrawingManager

[ekigamba]

• This disables drawing outside the boundary
• This also adds an editBoundary method that enables the mode

~# Remaining~

• [ ] ~Enable faster adding a point between two points for more manipulation of the boundary eg. Adding a V between two circles/point requires adding an extra point between the two points and dragging the new point~

~Currently, adding a point between two points is possible but requires selecting the point next to the target location~

Moved to https://github.com/onaio/kujaku/issues/350

[coveralls]

Pull Request Test Coverage Report for Build 1690

• 0 of 11 (0.0%) changed or added relevant lines in 1 file are covered.
• 3135 unchanged lines in 87 files lost coverage.
• Overall coverage decreased (-53.2%) to 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
library/src/main/java/io/ona/kujaku/manager/DrawingManager.java	0	11	0.0%
<!--	Total:	0	11	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
library/src/main/java/io/ona/kujaku/activities/MapActivity.java	1	0%
library/src/main/java/io/ona/kujaku/listeners/BaseLocationListener.java	1	0%
library/src/main/java/io/ona/kujaku/receivers/KujakuNetworkChangeReceiver.java	1	0%
library/src/main/java/com/mapbox/mapboxsdk/style/layers/ExposedPaintPropertyValue.java	2	0%
library/src/main/java/io/ona/kujaku/exceptions/InvalidArrowLineConfigException.java	2	0%
library/src/main/java/io/ona/kujaku/exceptions/WmtsCapabilitiesException.java	2	0%
library/src/main/java/io/ona/kujaku/utils/NumberFormatter.java	2	0%
library/src/main/java/io/ona/kujaku/wmts/model/WmtsTileMatrixSetLink.java	2	0%
utils/src/main/java/io/ona/kujaku/utils/exceptions/InvalidMapBoxStyleException.java	2	0%
library/src/main/java/io/ona/kujaku/comparisons/EqualToComparison.java	3	0%
<!--	Total:	3135		-->

Totals
Change from base Build 1677:	-53.2%
Covered Lines:	0
Relevant Lines:	5893

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💛 - Coveralls