Remove PWP::Encoding author dep
Include DropletActions role in main module
Fix syntax error in documentation
Include all methods in basic test
Rework entire API using hashrefs

Instead of "slurpy Dict's", or hashes as arguments to methods, use
hashrefs. Also, methods which had only one argument now don't use named
arguments anymore.
Bump version and update Changes file
Add sizes and regions role
Include sizes and regions roles in main module
Update Changes file
Update test to add new roles
Fix variable name