Run/Debug config should be serializable to file

[scottkurz]

Our Liberty Tools Run/Debug config lacks the ability to be serialized to a file, which is for many types of configs provided via the "Common" tab.

In the best case, this may be as simple as a line or two adding the Common tab... sort of like adding the JRE tab.

[scottkurz]

While the #485 PR added the tab in a nice, easy way, let's keep this open for the time being.

Some concern that there's all the extra, unused options. All we really need is the "Save as local/shared", and it'd be nice to include the "Favorites" entry but not as essential.

I'd say it's an open question if we should release as-is with all the extra vs. back out if we can't do something "lighter".

[scottkurz]

Fixed by #496