Fix HMD images, add DAE export, bump version to 0.9.9.1

[trigger-segfault]

• Fixed HMD textures not seeking to the start of image data (removed in last commit, whoops).
• Add DAE export models option.
• Fixed some handling of enabled/disabled options in Export Models form.
• Re-added icons for each form, since some of them (like the launcher form) were very crispy around the edges.
• Bumped version to 0.9.9.1
• Added version number to About window and replaced "(c)" with copyright unicode.
• -help command line argument will allow parsing the first two arguments as normal options, making it possible to specify -help -debug to keep the console open afterwards.
• Update README.md