replace shouldRecognizeDrag delegate methods with variables

[mac-gallagher]

• Make SwipeCardStack.animationOptions open instead of public
• Make SwipeCardStack.numberOfVisibleCards internal. The reason for doing this is because right now there is no visible effect from changing it to anything other than the default 2. Will make this public again if there is ever a change to the visual card stack layout
• Simplify solution to Allow card movement to swipe only defined directions #64 by replacing all delegate methods with shouldRecognizeHorizontalDrag/shouldRecognizeVerticalDrag on SwipeCardStack

[codecov-commenter]

Codecov Report

Merging #69 into master will decrease coverage by 0.19%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   82.26%   82.07%   -0.20%     
==========================================
  Files          13       13              
  Lines         654      647       -7     
==========================================
- Hits          538      531       -7     
  Misses        116      116              

Impacted Files	Coverage Δ
...urces/Shuffle/SwipeCard/CardAnimationOptions.swift	100.00% <ø> (ø)
...fle/SwipeCardStack/CardStackAnimationOptions.swift	100.00% <ø> (ø)
...ces/Shuffle/SwipeCardStack/CardStackAnimator.swift	0.00% <0.00%> (ø)
...uffle/SwipeCardStack/CardStackLayoutProvider.swift	100.00% <ø> (ø)
...Shuffle/SwipeCardStack/CardStackStateManager.swift	100.00% <ø> (ø)
...le/SwipeCardStack/CardStackTransformProvider.swift	0.00% <ø> (ø)
Sources/Shuffle/SwipeDirection.swift	100.00% <ø> (ø)
Sources/Shuffle/SwipeCard/CardAnimator.swift	100.00% <100.00%> (ø)
Sources/Shuffle/SwipeCard/CardLayoutProvider.swift	100.00% <100.00%> (ø)
...rces/Shuffle/SwipeCard/CardTransformProvider.swift	100.00% <100.00%> (ø)
... and 15 more