Fix/callback get url

[ibelar]

Delegate full control to App:url() method from Callback::getUrl() by passing an extra argument to App::url().

Prior to this, an hosting app did not have full control of url argument creation when using Callback with Form or Callback using POST_trigger property set to true.
By delegating the url creation to App::url() method, now an hosting app will have full control of arguments needed with returning url.

[codecov]

Codecov Report

Merging #271 into develop will decrease coverage by 0.57%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             develop   #271      +/-   ##
===========================================
- Coverage      75.57%    75%   -0.58%     
  Complexity      1131   1131              
===========================================
  Files             63     63              
  Lines           2800   2800              
===========================================
- Hits            2116   2100      -16     
- Misses           684    700      +16

Impacted Files	Coverage Δ	Complexity Δ
src/Callback.php	96.42% <100%> (-0.24%)	9 <0> (-1)
src/App.php	81.05% <100%> (+0.16%)	94 <17> (+1)	⬆️
src/jsSSE.php	17.54% <0%> (-31.58%)	19% <0%> (ø)
src/TableColumn/Status.php	84.37% <0%> (+6.25%)	10% <0%> (ø)	⬇️

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[codecov]

Codecov Report

Merging #271 into develop will increase coverage by 0.07%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #271      +/-   ##
=============================================
+ Coverage      75.57%   75.64%   +0.07%     
  Complexity      1131     1131              
=============================================
  Files             63       63              
  Lines           2800     2800              
=============================================
+ Hits            2116     2118       +2     
+ Misses           684      682       -2

Impacted Files	Coverage Δ	Complexity Δ
src/Callback.php	96.42% <100%> (-0.24%)	9 <0> (-1)
src/App.php	81.05% <100%> (+0.16%)	94 <17> (+1)	⬆️
src/TableColumn/Status.php	84.37% <0%> (+6.25%)	10% <0%> (ø)	⬇️

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[romaninsh]

looks good, will merge.