Pre-release cleanup

* Updated release script
* Updated ChangeLog
* Tweaked PNG chunk splitting threshold
Release 1.3
Updated release script
Fixed indentation in ChangeLog
Fixed .hdr texture loading error
Updated release script

Encrypt credentials
Release 1.3.1
Updated release script
Launcher: fixed Java options not updating

Fixed error causing the Java options filed to not be set to the saved string.

fixes #281 (github)
Stereographic projection