Feature/support for serialized fields

[romaninsh]

Field can have "serialize" property set:

$this->addField('tags', ['serialize'=>'json']);

This field will now be properly presented in the UI according to the type.

[DarkSide666]

What's the point to have $f->serialize parameter twice in exception?
And will it also show underlying exception message from agile data?

[codecov]

Codecov Report

Merging #548 into develop will decrease coverage by 1.03%.
The diff coverage is 9.09%.

@@             Coverage Diff              @@
##             develop    #548      +/-   ##
============================================
- Coverage      66.73%   65.7%   -1.04%     
- Complexity      1627    1631       +4     
============================================
  Files             91      91              
  Lines           3890    3901      +11     
============================================
- Hits            2596    2563      -33     
- Misses          1294    1338      +44

Impacted Files	Coverage Δ	Complexity Δ
src/Persistence/UI.php	40.74% <9.09%> (-4.98%)	43 <0> (+4)
src/jsCallback.php	27.27% <0%> (-39.4%)	32% <0%> (ø)
src/App.php	69.91% <0%> (-2.04%)	109% <0%> (ø)
src/View.php	80.81% <0%> (-0.95%)	136% <0%> (ø)

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