Make editor's run/debug command names more specific

[weinand]

With the arrival of the new "run/debug" split-button we are trying to come up with some good naming conventions (and since the Java extension is always a good first adopter, we are starting here).

These are the commands used today:

Since the commands are contributed only for *.java files, the "Java" in the "Run Java" name is somewhat redundant. Wouldn't it be more helpful to refer to the file's entry point and use "Run Main" and "Debug Main"?

And if the Java file contains tests, then "Run Tests" and "Debug Tests" could be used?