Deprecate AbstractApp class

[koriym]

Use AppInterface. See https://github.com/bearsunday/BEAR.Skeleton/blob/1.x/src/Module/App.php

[codecov]

Codecov Report

Merging #164 (68924ee) into 1.x (f4fdd69) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                 1.x      #164   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        52        52           
===========================================
  Files             19        18    -1     
  Lines            131       129    -2     
===========================================
- Hits             131       129    -2     

Impacted Files	Coverage Δ
src/Extension/Router/RouterMatch.php	100.00% <100.00%> (ø)
src/Provide/Router/WebRouter.php	100.00% <100.00%> (ø)
...c-deprecated/Extension/Application/AbstractApp.php

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