Add "Converter" setting (Set to FURNACE or STONECUTTER) (resolve #44)

[Poikilos]

Its up to you if you want this, but it works fine. Let me know if anything doesn't seem right. Some testing in older versions should probably be done as explained.

• Converter: FURNACE in recipe file (under main section) makes a Furnace recipe.
• Converter: STONECUTTER in recipe file (under main section) makes a Stonecutter recipe.
  • Completely avoids the StonecutterRecipe class in versions below 1.14 for backward compatibility, by using fully qualified name instead of importing it.
  • [ ] test in version below 1.14 (plugin should show an error only if Converter: STONECUTTER is in a recipefile).

Other changes:

• Adds new serverVersionBelow and serverVersionAtLeast methods to make the code more clear and reliable
  • Old code (other than NBTEditor which is very specific about version parsing) also uses the methods now.
  • If version notation is not detected, serverVersionAtLeast returns true anyway, and serverVersionBelow returns false anyway (makes code try to run if version isn't detected, like the old code which only checked for "1_7" etc and disallowed those specific versions)
  • [ ] test in version below 1.7
• adds instructions about missing JAR references to a new file: references/requirements.md
• Rename r to gridRows for clarity.
• Improve the wording of an error which caused issue #4 (which was a question not unexpected behavior).

Tested with only Paper 1.20.1 and 1.20.4, but built jar against AdvancedEnchantments-8.7.4.jar, latest BungeeCord.jar, PlaceholderAPI-2.11.5.jar, spigot-api-1.19.2-R0.1-20221106.071812-39.jar from URLs noted in requirements.md.

[mehboss]

Hey Poikilos! I have looked over the code and I have no issue approving and merging this. Thank you for implementing these features in CR. You might not see it get uploaded to SpigotMC until a later date. I need to get around to doing a few things -- such as:

https://github.com/mehboss/CustomRecipes/issues/43 https://github.com/mehboss/CustomRecipes/issues/39 https://github.com/mehboss/CustomRecipes/issues/31 https://github.com/mehboss/CustomRecipes/issues/24 https://github.com/mehboss/CustomRecipes/issues/42

And last but not least, the GUI.,, I may release an update prior to completing the GUI, however.

Thank you again!