v1.0.0 rc4 Small bug fixes and improvements

NOTE: VRChatApiTools is no longer included with VRBuildHelper as it is a dependency for multiple projects. If you haven't already manually installed it, please do so by following this guide.

• Re add single target autonomous uploader
• Prevent error messages from not showing up on upload errors
• Fix a small edge case causing builder to not work sometimes

Full Changelog: v1.0.0rc3...v1.0.0rc4