Add ClassNotFoundException

[summer-alice]

This adds the ClassNotFoundException class.

As sort of mentioned in #103, when trying to implement a new constructor for the Image class, I encountered a cyclic dependency error.

I have a local fix complete, this is just the beginning of it.

This also drops support for Tango in the file.

[jacob-carlborg]

It sounds like ClassNotFoundException might be thrown when a class is dynamically loaded in Java. Is that applicable on D? How will this exception be used in D?

[summer-alice]

It sounds like ClassNotFoundException might be thrown when a class is dynamically loaded in Java. Is that applicable on D?

Yea that's about it. In D, the same is achieved with Object.factory, however, the return from that is null if the class can't be found (instead of the exception).

How will this exception be used in D?

My intention for adding this was so it can be used by the implementation of Class.forName. This just allows the DWT code to be consistent with SWT. (e.g. FileFormat (lines 33-38 & 70-87).)

[jacob-carlborg]

Thanks.

[summer-alice]

Thanks.

Thank you.