[Java.Interop.Tools.JavaSource] Remove block and inline @cref values

Context: #843
Context: xamarin/android-api-docs#23

A handful of "broken" Javadoc to C# Doc conversions have been disabled
for now.  This will hopefully help reduce the number of new warnings
introduced by xamarin/android-api-docs#23, and
allow us to get an initial major documentation update landed in the
short term.  Longer term, we will revisit and fix these Javadoc
conversion issues.

Additionally, `Javadoc.cs` has been removed from tools/generator as it
appeared to be an unused partial duplicate of `JavadocInfo.cs`.

Author: pjcollins

src/Java.Interop.Tools.JavaSource/Java.Interop.Tools.JavaSource/SourceJavadocToXmldocGrammar.BlockTagsBnfTerms.cs

@@ -89,12 +89,14 @@ internal void CreateRules (SourceJavadocToXmldocGrammar grammar)
 					if (!grammar.ShouldImport (ImportJavadoc.ExceptionTag)) {
 						return;
 					}
-					// TODO: convert `nonSpaceTerm` into a proper CREF
+					/* TODO: convert `nonSpaceTerm` into a proper CREF
 					var e = new XElement ("exception",
 							new XAttribute ("cref", string.Join ("", AstNodeToXmlContent (parseNode.ChildNodes [1]))),
 							AstNodeToXmlContent (parseNode.ChildNodes [2]));
 					FinishParse (context, parseNode).Exceptions.Add (e);
 					parseNode.AstNode   = e;
+					*/
+					FinishParse (context, parseNode);
 				};
 
 				ParamDeclaration.Rule = "@param" + nonSpaceTerm + BlockValues;
@@ -135,11 +137,15 @@ internal void CreateRules (SourceJavadocToXmldocGrammar grammar)
 					if (!grammar.ShouldImport (ImportJavadoc.SeeTag)) {
 						return;
 					}
-					// TODO: @see supports multiple forms; see: https://docs.oracle.com/javase/7/docs/technotes/tools/windows/javadoc.html#see
+					/* TODO: @see supports multiple forms; see: https://docs.oracle.com/javase/7/docs/technotes/tools/windows/javadoc.html#see
+					// Also need to convert to appropriate CREF value, ignore for now
 					var e = new XElement ("seealso",
 							new XAttribute ("cref", string.Join ("", AstNodeToXmlContent (parseNode.ChildNodes [1]))));
 					FinishParse (context, parseNode).Extra.Add (e);
 					parseNode.AstNode   = e;
+					*/
+					FinishParse (context, parseNode);
+
 				};
 
 				SinceDeclaration.Rule = "@since" + BlockValues;
@@ -157,12 +163,14 @@ internal void CreateRules (SourceJavadocToXmldocGrammar grammar)
 					if (!grammar.ShouldImport (ImportJavadoc.ExceptionTag)) {
 						return;
 					}
-					// TODO: convert `nonSpaceTerm` into a proper CREF
+					/* TODO: convert `nonSpaceTerm` into a proper CREF
 					var e = new XElement ("exception",
 							new XAttribute ("cref", string.Join ("", AstNodeToXmlContent (parseNode.ChildNodes [1]))),
 							AstNodeToXmlContent (parseNode.ChildNodes [2]));
 					FinishParse (context, parseNode).Exceptions.Add (e);
 					parseNode.AstNode   = e;
+					*/
+					FinishParse (context, parseNode);
 				};
 
 				// Ignore serialization informatino

src/Java.Interop.Tools.JavaSource/Java.Interop.Tools.JavaSource/SourceJavadocToXmldocGrammar.InlineTagsBnfTerms.cs

@@ -47,18 +47,17 @@ internal void CreateRules (SourceJavadocToXmldocGrammar grammar)
 				LinkDeclaration.Rule = grammar.ToTerm ("{@link") + InlineValue + "}";
 				LinkDeclaration.AstConfig.NodeCreator = (context, parseNode) => {
 					// TODO: *everything*; {@link target label}, but target can contain spaces!
-					// Also need to convert to appropriate CREF value
+					// Also need to convert to appropriate CREF value, use code text for now.
 					var target = parseNode.ChildNodes [1].AstNode;
-					var x = new XElement ("c");
-					parseNode.AstNode = new XElement ("c", new XElement ("see", new XAttribute ("cref", target)));
+					parseNode.AstNode = new XElement ("c", target);
 				};
 
 				LinkplainDeclaration.Rule = grammar.ToTerm ("{@linkplain") + InlineValue + "}";
 				LinkplainDeclaration.AstConfig.NodeCreator = (context, parseNode) => {
 					// TODO: *everything*; {@link target label}, but target can contain spaces!
-					// Also need to convert to appropriate CREF value
+					// Also need to convert to appropriate CREF value, use code text for now.
 					var target = parseNode.ChildNodes [1].AstNode;
-					parseNode.AstNode = new XElement ("see", new XAttribute ("cref", target));
+					parseNode.AstNode = new XElement ("c", target);
 				};
 
 				LiteralDeclaration.Rule = grammar.ToTerm ("{@literal") + InlineValue + "}";