Minor readability edits to SoundTestPlugin
Sound Test extension case hotfix

Fix for bug where non-lowercase file extension causes sound test plugin not to pick it up
Consistency updates, bug fixes

Fixed plugin top-level menus not being removed when plugin unloaded
Sort Open File Dialog filters alphabetically

This way the order of the filters doesn't change if the plugins get loaded in a different order.
Editor Settings dialog overhaul

Presets are always visible
Merge pull request #22 from fatcerberus/master

Settings dialog update