Add methods for reading and manipulating horizontal scollbars in text editor.

Deprecate old methods to prefer methods with Vertical/Horizontal in their names.
Merge pull request #2492 from jdf/master

Add methods for reading and manipulating horizontal scollbars in text editor.
minor edits
fix for #2463 and other todo notes
clearing things up a bit
cleanups and format fixes
looking into embedded Java issue w/ 64-bit Windows batch script
notes about fix for #2468
fix for #2349, use embedded Java with Linux