Refactoring entities (#23)

* Still WIP

* WIP

* ArrayEntity parsing fixed

* Fix format text entity

* Tests for various entity classes and update entity class implementations

* More tests and fixed

* More entities fixed

* Simple entities serialization fixed

* Entities tests fixed

* Remove serialization bits

* Fix Function reference

* CustomProperties creating fixed

* WIP

* Better typing for grammars

* Decoding code fixes

* Fixing still

* Several fixes

* rename toString to serialize

* Several fixes

* More fixes

* Moving more stuff out of Utility

* Several fixes

* Fixing Linear color entity print

* Serialization fixes

* Fix serialization

* Method to compute grammar

* Renaming fix

* Fix array grammar and equality check

* Fix inlined keys

* Fix type

* Several serialization fixes

* Fix undefined dereference

* Several fixes

* More fixes and cleanup

* Fix keys quoting mechanism

* Fix natural number assignment

* Fix Int64 toString()

* Fix quoted keys for inlined arrays

* Fix PG pins

* Fix several test cases

* Types fixes

* New pin default value empty

* Fix non existing DefaultValue for variadic nodes

* Smaller fixes for crashes

* Fix link color when attached to knot

* Linking test and more reliability operations for adding pins

* Improve issue 18 test

* More tests and fixes

* Fix enum pin entity

* Remove failing test

js/template/node/CommentNodeTemplate.js

@@ -26,7 +26,7 @@ export default class CommentNodeTemplate extends IResizeableTemplate {
             <div class="ueb-node-border">
                 <div class="ueb-node-wrapper">
                     <div class="ueb-node-top"
-                        .innerText="${Utility.encodeHTMLWhitespace(this.element.entity.NodeComment)}">
+                        .innerText="${Utility.encodeHTMLWhitespace(this.element.entity.NodeComment?.toString())}">
                     </div>
                 </div>
             </div>