Add weights to Gen

[nai888]

Is your feature request related to a problem? Please describe.
There is currently no way to control the frequency of certain results. This should be added via weights.

Describe the solution you'd like
Add the ability to use * asterisks to weight certain options more than others. For example, the code CV*2/CVC will produce output where the pattern CV is twice as likely to appear as CVC is.

Additional context
You can find the instructions for using this feature within Awkwords in its help file.