Feature/autocomplete field

[romaninsh]

Implementation of AutoComplete with a callback. (#243). Simple use:

$model->hasOne('country_id', [new Country(), 'ui'=>['Form'=>'Autocomplete']]);

Auto-complete allows your dropdown to have more entries and only load the ones that match user typing. It allows to search for phrases or even in multiple fields.

Drag a SCREENSHOT here:

• Documentation: docs/file.rst
• Demo: demos/file.php

p.s. set label "in review" and assign reviewers if PR is complete. Otherwise set "work in progress" label.

[codecov]

Codecov Report

Merging #245 into develop will increase coverage by 3.1%.
The diff coverage is 52.85%.

@@             Coverage Diff              @@
##             develop     #245     +/-   ##
============================================
+ Coverage      71.34%   74.45%   +3.1%     
- Complexity      1110     1128     +18     
============================================
  Files             62       63      +1     
  Lines           2729     2791     +62     
============================================
+ Hits            1947     2078    +131     
+ Misses           782      713     -69

Impacted Files	Coverage Δ	Complexity Δ
src/FormField/CheckBox.php	81.81% <ø> (ø)	6 <0> (?)
src/FormField/Generic.php	91.66% <ø> (ø)	6 <0> (ø)	⬇️
src/DropDown.php	100% <ø> (ø)	2 <0> (?)
src/FormField/TextArea.php	100% <ø> (ø)	4 <0> (?)
src/FormField/DropDown.php	96.66% <ø> (ø)	10 <0> (?)
src/TableColumn/CheckBox.php	93.33% <0%> (ø)	6 <0> (?)
src/FormLayout/Generic.php	90.75% <100%> (+5.04%)	50 <0> (+1)	⬆️
src/FormField/Input.php	98.46% <100%> (+0.07%)	30 <1> (+1)	⬆️
src/Grid.php	80.55% <100%> (ø)	28 <0> (ø)	⬇️
src/View.php	80.95% <100%> (+1.26%)	129 <7> (ø)	⬇️
... and 15 more

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