mymonero-core-js: create_address -- no longer there in #cpp branch

Hi,

I am adding this as a separate issue here and realize that this is not related to the master branch. But for our intents we are relying on the cpp branch as that branch can be packaged by the latest version of react-scripts.

However, earlier using the code in the master branch, we were able to generate a public address and private spend key, by providing a seed (and networkType) to the mymoneroCoreJs.monero_utils.create_address function like so:

this.account = mymonero.monero_utils.create_address(this.moneroSeed, this.netType);

and then elsewhere use this.account to get:

let pubAddress = moneroAccount.account.public_addr
let privateKey = moneroAccount.account.spend.sec

With the #cpp branch, the create_address function is no longer available. So how do we go about getting the public address and the private spend key?