0.5.2

• Upstream fixes
  • Dark color alpha inconsistent between binary and JSON formats (EsotericSoftware/spine-runtimes#2263)
  • Atlas defaults are not handled (EsotericSoftware/spine-runtimes#2264)
• Set dark color's alpha to 0 for non-PMA and 1 for PMA textures in drawers (the dark color's alpha is not typically used, so this is merely a convenience)