Fixed a bug in functions/ClosedVariable.java

I had forgotten to replace value with getValue
Fixed the import statement in DynamicDelegate.java

I was missing the import for java.util.Set;
Fixed an issue in DynamicDelegateBase with a comment

I had accidentally commented out a curly brace and screwed up the
DynamicDelegateBase class.
Replaced value() with getValue() in FunctionalOperators.java
FunctionalOperators: replaced value with setValue

Those old method names are from a very old version where I didn't care about
java conventions so it was more like C#.
Added a gitignore so that class files do not show up
Added the java.util.* import to DynamicDelegateBase.java
Added an import static to AbstractDelegateBody
Updated DelegateBody.java to use get/set conventions
Fixed a situation where I called get instead of set in FunctionalOperators.java
fixed compilation errors
Renamed FunctionalOperators.java to FunctionalOperations.java

This makes the name of the file accurate to the name of the class