Make HarvestRegistry available from API and fix Mystical Agriculture crops with harvest ritual

Added getHarvestRegistry() to IBloodMagicAPI and BloodMagicAPI
Modified HarvestRegistry to not be static to make it consistent with other API things
Moved the registration calls from ritual/ModRituals to impl/BloodMagicCorePlugin
Removed compat with mods not in 1.20 and Pams HarvestCraft as I couldnt find a 1.20 version of the repo/api
Added compat/MysticalAgricultureCompat, when its loaded it registers their crops. Uses the actual mag api jar instead of Class.forName() and such
Added repository/dependencies for Mystical Agriculture (commented out the runtime stuff)
Added version variables for mag and the needed cucumber library in gradle.properties

(Changed my setup again, auto-formatting doesnt seem to work all the time, hope i caught at least most of it)

WayofTime / BloodMagic