ParameterScriptProcessor: default type as Object

Now you can leave off the type, saying only e.g.:

  #@output thing

And it will implicitly mean:

  #@output Object thing

This is useful if you are too lazy to specify your output types,
or you don't know in advance what it will be, or the type would
be some obnoxiously long fully qualified class name like
java.util.function.Function.

Author: ctrueden

src/main/java/org/scijava/script/process/ParameterScriptProcessor.java

@@ -62,8 +62,9 @@
  * supported:
  * </p>
  * <ul>
- * <li>{@code #@<type> <varName>}</li>
- * <li>{@code #@<type>(<attr1>=<value1>, ..., <attrN>=<valueN>) <varName>}</li>
+ * <li>{@code #@ <type> <varName>}</li>
+ * <li>{@code #@ <type>(<attr1>=<value1>, ..., <attrN>=<valueN>) <varName>}</li>
+ * <li>{@code #@<IOType> <varName>}</li>
  * <li>{@code #@<IOType> <type> <varName>}</li>
  * <li>{@code #@<IOType>(<attr1>=<value1>, ..., <attrN>=<valueN>) <type>
  * <varName>}</li>
@@ -77,7 +78,8 @@
  * <li>{@code <IOType>} - one of {@code INPUT}, {@code OUTPUT}, or {@code BOTH}.
  * </li>
  * <li>{@code <varName>} - the name of the input or output variable.</li>
- * <li>{@code <type>} - the Java {@link Class} of the variable.</li>
+ * <li>{@code <type>} - the Java {@link Class} of the variable, or
+ * {@link Object} if none specified.</li>
  * <li>{@code <attr*>} - an attribute key.</li>
  * <li>{@code <value*>} - an attribute value.</li>
  * </ul>
@@ -90,9 +92,9 @@
  * <ul>
  * <li>{@code #@Dataset dataset}</li>
  * <li>{@code #@double(type=OUTPUT) result}</li>
- * <li>{@code #@BOTH ImageDisplay display}</li>
- * <li>{@code #@INPUT(persist=false, visibility=INVISIBLE) boolean verbose}
- * </li>
+ * <li>{@code #@both ImageDisplay display}</li>
+ * <li>{@code #@input(persist=false, visibility=INVISIBLE) boolean verbose}</li>
+ * <li>{@code #@output thing}</li>
  * </ul>
  * <p>
  * Parameters will be parsed and filled just like @{@link Parameter}-annotated
@@ -187,11 +189,18 @@ private boolean parseParam(final String param,
 		final String typeName, varName;
 		final String maybeIOType = tokens[0].toUpperCase();
 		if (isIOType(maybeIOType)) {
-			// assume syntax: <IOType> <type> <varName>
-			if (tokens.length < 3) return false;
+			if (tokens.length == 2) {
+				// <IOType> <varName>
+				typeName = "Object";
+				varName = tokens[1];
+			}
+			else if (tokens.length == 3) {
+				// <IOType> <type> <varName>
+				typeName = tokens[1];
+				varName = tokens[2];
+			}
+			else return false;
 			attrs.put("type", maybeIOType);
-			typeName = tokens[1];
-			varName = tokens[2];
 		}
 		else {
 			// assume syntax: <type> <varName>