Updated eJSON to use Eiffel 6.8 version.

Basically the changes are:

Replace ? by detachable
indexing by note
removing `is' from features, and in some places replaced by =
In the ecf now we need to include every gobo library, because the gobo.ecf, exclude libraries that are needed.
TODO: the test-suite is not void-safety.

library/kernel/shared_ejson.e

@@ -1,4 +1,4 @@
-indexing
+note
     description: "[
                    Shared factory class for creating JSON objects. Maps JSON
                    objects to ELKS HASH_TABLEs and JSON arrays to ELKS
@@ -15,7 +15,7 @@ class SHARED_EJSON
 
 feature
 
-    json: EJSON is
+    json: EJSON
             -- A shared EJSON instance with default converters for
             -- DS_LINKED_LIST [ANY] and DS_HASH_TABLE [ANY, HASHABLE]
         local