Generic GestureRecognizer and TapGestureRecognizer hooks

[Albert221]

See #190.

[codecov]

Codecov Report

Merging #191 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #191   +/-   ##
=======================================
  Coverage   99.67%   99.68%           
=======================================
  Files          10       11    +1     
  Lines         616      633   +17     
=======================================
+ Hits          614      631   +17     
  Misses          2        2           

Impacted Files	Coverage Δ
lib/src/gesture_recognizers.dart	100.00% <100.00%> (ø)

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[rrousselGit]

Closing as per #190 (comment)

I appreciate your work, but I just don't think that is the correct path for this kind of thing