Separate bridgedb.txrecaptcha into another package
We should separate txrecaptcha into its own package so that others can use it, and also to reduce the amount of code that is non-BridgeDB-specific which resides in BridgeDB.
We should separate txrecaptcha into its own package so that others can use it, and also to reduce the amount of code that is non-BridgeDB-specific which resides in BridgeDB.