Fix #183: Move URI prefix to RouteCollection

[rustamwin]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.64%. Comparing base (805f0d8) to head (dda40ba).
⚠️ Report is 60 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #192      +/-   ##
============================================
+ Coverage     97.61%   97.64%   +0.02%     
- Complexity      140      142       +2     
============================================
  Files             9        9              
  Lines           419      424       +5     
============================================
+ Hits            409      414       +5     
  Misses           10       10              

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[samdark]

Need a major release since it breaks BC.

[vjik]

UrlGeneratorInterface not depend from RouteCollection and may used:

1. without RouteCollection,
2. with one RouteCollection,
3. with several RouteCollection.

We must keep URI prefix in UrlGeneratorInterface.