Add support for disabling snap dock for a window via snap option parameter

[bingenito]

• Add getOptions() to base ContainerWindow and implement in each concrete.
• Support disable of individual windows from participating in snap docking with snap parameter in custom options to createWindow().
  container.createWindow(url, { snap: false });

[codecov]

Codecov Report

Merging #180 into master will decrease coverage by 0.25%.
The diff coverage is 80.64%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
- Coverage    93.8%   93.54%   -0.26%     
==========================================
  Files          15       15              
  Lines        1339     1364      +25     
  Branches      223      229       +6     
==========================================
+ Hits         1256     1276      +20     
- Misses         83       88       +5

Impacted Files	Coverage Δ
src/Default/default.ts	97.58% <100%> (+0.03%)	⬆️
src/OpenFin/openfin.ts	86.66% <100%> (+0.18%)	⬆️
src/Electron/electron.ts	96.32% <70%> (-0.77%)	⬇️
src/window.ts	88.68% <80%> (-0.52%)	⬇️

[psmulovics]

Strange diff on window.ts

[bingenito]

@psmulovics re: window.ts, I refactored the entire contents of a callback into a separate method (onMoving()).

[bingenito]

Disable whitespace diff and use split view instead of unified

[psmulovics]

yeah, much better that way