Hide relations or property groups

[stefanorosanelli]

Whit this PR you can easily hide a relation or property group in an object view.

With a new empty Form/empty element you can create configurations like this:

'cats' => [
            'view' => [
                'core' => [
                    'petname',
                ],
               'advanced' => [
                     '_element' => 'Form/empty',
               ],
            ],

            'relations' => [
                '_element' => [
                    'has_friends' => 'Form/empty',
                ],
            ],
 ],

In the resulting view:

• Advanced property group will be hidden
• Has Friends relation tab will be empty

[codecov]

Codecov Report

Merging #522 (907ecdb) into master (d553579) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #522      +/-   ##
============================================
+ Coverage     91.07%   91.10%   +0.02%     
- Complexity      708      710       +2     
============================================
  Files            44       44              
  Lines          2130     2137       +7     
============================================
+ Hits           1940     1947       +7     
  Misses          190      190              

Impacted Files	Coverage Δ	Complexity Δ
src/Plugin.php	100.00% <100.00%> (ø)	1.00 <1.00> (ø)
src/View/AppView.php	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
src/View/Helper/LayoutHelper.php	100.00% <100.00%> (ø)	9.00 <2.00> (+2.00)
src/View/Helper/PermsHelper.php	100.00% <100.00%> (ø)	8.00 <8.00> (ø)

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