fix/#487-Modal Behaviour

[ibelar]

Fix multiple modal positioning when using multiple modal;

• Modals under top modal opacity are set to 0, they look hidden but they are still available.
  • this is need for modalServices to work properly.
  • We can set the opacity value to an higher number if the intent is still be able to see under modals.
• Proper positioning is done by setting position value to absolute.
• Fix the esc key behaviour. Simply adding our own esc event in modal service.

Update modal2.php demos files in order to show modal at three level deep.

Note

atkjs-ui need to be rebuild.

[codecov]

Codecov Report

Merging #496 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #496   +/-   ##
==========================================
  Coverage      65.71%   65.71%           
  Complexity      1568     1568           
==========================================
  Files             88       88           
  Lines           3754     3754           
==========================================
  Hits            2467     2467           
  Misses          1287     1287

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[romaninsh]

works really well. Haven't tested with CRUD in modal yet.