Add support for long array tags

Add a few more known NBT extensions to the file pattern for directory…

… enumeration. Closes jaquadro#21.  File-based open can already handle all extensions, from jaquadro#31.

Fix key collision crash in some searches. Add version to About dialog.

Update version info

Fix crash when refreshing an unexpanded node. Improve error logging.

Fix array editor disabled

Fix array editor disabled

Update installer version

Restructuring project to support separate command-line utility

More rigorous startup failure checking and reporting