Added an interface to the API to allow a world provider to not generate Botania flowers

Signed-off-by: Justin Wiblin <Justin_wiblin@hotmail.co.uk>
Added a boolean returning function to the interface

Signed-off-by: Justin Wiblin <Justin_wiblin@hotmail.co.uk>
Merge pull request #331 from Thelonedevil/FlowerlessWorlds

Added an interface to the API to allow a world provider to not generate ...