Migrate GTExtensions package to NewTools

[tinchodias]

The extension package is not trivial but we should have at least some basic tree of nodes in the Pharo 10 inspector.

[tinchodias]

I took a glance at the GTExtensions package and most of the code there seems to be not GT-related but a highlighter.

I tried how simple was to use that highlighter in a Pharo 10 and had this error: "XMLFileException: (XMLFileException) File reading unsupported"

To reproduce:

1. Load default metacello in P10.
2. Manually load the package using Iceberg.
3. Evaluate:

   
   xmlFileReference := 'test.xml' asFileReference.
   xmlFileReference writeStreamDo: [ :aStream |
   aStream nextPutAll:
       '<?xml version="1.0" encoding="UTF-8"?>
   <countries>
     <country code="af" handle="afghanistan" continent="asia" iso="4">Afghanistan</country>
     <country code="al" handle="albania" continent="europe" iso="8">Albania</country>
     <country code="dz" handle="algeria" continent="africa" iso="12">Algeria</country>
   </countries>' ].

xmlFileHandle := XMLFileSystemFileHandle fileReference: xmlFileReference.

(XMLExternalDocumentConverter convertFileNamed: xmlFileHandle path)

[tinchodias]

And I forgot the say that the cause it that the XMLExternalDocumentConverter uses XMLFileReadStreamFactory which tries to find StandardFileStream

[astares]

@tinchodias where is XMLExternalDocumentConverter from?

[astares]

I introduced a new package "XML-Parser-Tools" using

• Spec tree presenter to show the tree of nodes
• Spec table presenter to show attributes
• Spec text presenter to show the source contents

[astares]

Fixed for now. Reintroducing colors (if needed) should be handled in #23