feat: 2.0.3 1.x retrocompatibility, stego_dir update, read amboso_kern, try using gawk, najlo

[jgabaut]

• Add min_amboso_v_ consts to better wrap extensions to 2.0
• Add interpreter branch for when the queried tag ends with stego.lock
  • ATM the interpretation ends up going to try_make()
• Add stego_dir logic to set a different location for stego.lock than scripts_dir
  • The new default is ../., but a fallback to scripts_dir should ensure backwards compatibility
• Add legacy lex for 1.x stego.lock files, available by using -a <VERSIONlessThan2.0> when calling the script
• Add forced global source
  • When passing -a as first argument, the sourcing will be forced from global amboso_fn.sh instead of local.
  • Could be useful for breaking changes that may need a newer API than the repo one.
• Read amboso_kern from stego.lock, backwards compatible
  • Should need 2.0.3 min to be used
• Fix: try using gawk when awk seems to be mawk
  • Closes #58
• Avoid passing extended flags to patches below their introduction
• Add -Xx option to run as najlo, to parse Makefiles
  • Uses a copypaste of najlo.sh
  • Experimental