Add ability to resize an existing circle by clicking twice

[StijnAmeloot]

By default a circle can now be resized by clicking twice along the ring.
The 'dragToDraw' option has been added to the mode config to enable dragging instead of clicking twice.

Example (shows first the two-click mode and after that the drag to draw mode)

[coveralls]

Pull Request Test Coverage Report for Build 2290

• 0 of 35 (0.0%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 22.017%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
modules/edit-modes/src/lib/resize-circle-mode.ts	0	35	0.0%

Files with Coverage Reduction	New Missed Lines	%
modules/edit-modes/src/lib/resize-circle-mode.ts	4	0%

Totals
Change from base Build 2287:	-0.1%
Covered Lines:	1218
Relevant Lines:	5219

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💛 - Coveralls

[StijnAmeloot]

Fixed a small issue and added a gif which shows the two different modes.
Please let me know if there is anything that needs to be improved.

[igorDykhta]

1. I think dragToDraw: true should be by default
2. Not sure how the mode with dragToDraw: false should work. I activated the resizing mode, then I clicked anywhere, no response at this point, then the circle starts to resize with any mouse movement, then I need to click to finish resizing. I assume the resizing should only start after clicking on the small helper circle which appears on the edge of the circle.