Spring Community Edition release 1.3.1

Bugfixes and improvements.

• Merged AntelopeIO#1841
• Merged AntelopeIO#1845
• Merged AntelopeIO#1873
• Merged AntelopeIO#1875
• Merged AntelopeIO#1876
• Merged AntelopeIO#1877
• Merged AntelopeIO#1879
• Merged AntelopeIO#1881

Spring Community Edition release 1.3.0

Latest updates from main branch at https://github.com/AntelopeIO/spring , under MIT license.