Lstgen

* Added golang generator which supersedes go generator (thanks polderudo)
* Fixed empty if-body in python
* Added javascript example (thanks 0xCCD)
* Added 2022 PAP (thanks 0xCCD)

* Added php BigDecimal fixes (thanks tburschka)

* Added python3.9 ast module compatiblity

* Added resources for year 2021 (thanks 0xCCD)

* Added fix for double types in Go (thanks knipknap)

* Added Go support (thanks knipknap for the code and Dexus for the review!)