Add egs_view egsinp editor with autocompletion

[rtownson]

Add a new tab in egs_view that allows for editing and saving egsinp files for egs++.

The new code all over the egs++ library provide a structure by which an external library like egs_view can extract all of the input parameters. It's used for input validation, syntax highlighting, autocompletion, etc.

Application specific inputs are not handled yet. Also not yet run control, transport parameters, media definitions, or view control.

Note that this includes an astyle run on all the sources, geometries and ausgab objects, so it looks like there are more changes than there are. If you view the diff while hiding whitespace, then you will see the real changes.

This replaces PR #710.

[ftessier]

@rtownson can I work to cleanup this branch, or would you rather I hold off?

[rtownson]

@rtownson can I work to cleanup this branch, or would you rather I hold off?

Maybe hold off, I'm just working on documentation so I'll be adding one more commit some time soon.

[rtownson]

Ok @ftessier, you're welcome to clean up this branch now.