Beacon 1.2 Beta 2

This second beta fixes a few important issues discovered shortly after testing of Beacon 1.2 began.

• Database migration has been fixed. Beacon should successfully carry over engrams and presets when launching 1.2 for the first time.
• Old update files get cleaned up now. Sorry about that.
• Fixed exception when trying to show the new database manager twice.
• Reverting changes to multiple engrams/creatures now works.
• Creating a new database object will perform some sanity checks first, rather than simply erroring on missing data.
• The mini browser used for Nitrado authentication will now show error messages instead of sitting silently at a white window.
• Database manager can once again export its contents to CSV. The import process has been improved to handle the additional data.