Release 1.3.0

What's changed

• Added legacy ResourcePackage parsing: Support for reading various legacy rpkg formats (read-only). Generation of legacy packages is not supported.
  An updated example is now included as documentation
• Improved packagedefinition parsing: More package names will be correctly parsed now (Thanks @atampy25)
• Deprecated ini_system: The ini_system module is now deprecated in favor of the glacier-ini crate.
• Updated dependencies