Router tweaks

[ahopkins]

• Branches off API Docs & Annotations #2006, so merge that first.
• Fixes url_for() doesn't return a working URI for a route with the trailing slash and strict_slashes=True #1420 (url_for where strict_slashes are on for a path ending in /)
• Fixes Routing is incorrect with some special characters (e.g. dot) #1525 to allow for partial matching
• Adds Request.route
• Allow for partial regex matching

[codecov]

Codecov Report

Merging #2031 (ffe3450) into master (4b968dc) will increase coverage by 0.057%.
The diff coverage is 91.667%.

@@              Coverage Diff              @@
##            master     #2031       +/-   ##
=============================================
+ Coverage   91.754%   91.811%   +0.057%     
=============================================
  Files           35        35               
  Lines         3226      3224        -2     
  Branches       557       556        -1     
=============================================
  Hits          2960      2960               
+ Misses         181       179        -2     
  Partials        85        85               

Impacted Files	Coverage Δ
sanic/mixins/routes.py	94.898% <66.667%> (+0.959%)	⬆️
sanic/app.py	91.361% <88.889%> (-0.432%)	⬇️
sanic/request.py	97.857% <100.000%> (+0.015%)	⬆️
sanic/router.py	94.667% <100.000%> (+2.459%)	⬆️

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[sjsadowski]

No real quibbles. Appreciate the increased internal consistency.

[ahopkins]

No real quibbles. Appreciate the increased internal consistency.

How about fake ones?