Allow use nested values for arrays and nulled objects

[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	#262

[what-the-diff]

PR Summary

• Introduction of Fresh Exceptions
  New files have been introduced that enable the system to respond and handle various error situations better. These include scenarios where nested values aren't properly supported, there are issues with the properties of an object, a desired value is missing and more.

• Augmentation of Form Attribute Handling
  The FormAttributeTrait.php, FormModel.php, FormModelInterface.php and HtmlForm.php files have been modified. This enhancement brought in better ways to manage and deal with form attribute values. Moreover, if issues arise while dealing with these values, they have implemented additional exception handling logic.

• Upgraded Testing for Nested Structures in Forms
  There have been alterations made to InputFieldTest.php and FormModelTest.php, which introduced new tests and assertions. These have been designed to handle new changes associated with nested structures in forms.

• Improved Support for Form and Coordinates Representation
  New attributes and classes have been incorporated in TextForm.php and Coordinates.php which are designed to provide better support and representation of forms and coordinates, respectively.

• Creation of a Form Class to Handle Nested Structures
  A new form class with nested structures has been developed and added to FormWithNestedStructures.php, aiming at suitably dealing with intricate form structures.

• Removal of Outdated Files
  The files UndefinedPropertyException.php, NonNamespacedForm.php and DynamicAttributesForm.php have been taken off as they are obsolete and no longer required in the system.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dad3a5a) 98.92% compared to head (b2b2bf4) 98.93%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #272   +/-   ##
=========================================
  Coverage     98.92%   98.93%           
- Complexity      855      860    +5     
=========================================
  Files            48       51    +3     
  Lines          2521     2531   +10     
=========================================
+ Hits           2494     2504   +10     
  Misses           27       27           

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