Option to provide full solution name, rather than templating one

**Is your feature request related to a problem? Please describe.**
Often when the solution sub-generator is run, the solution already exists but does not match the templated solution name. This involves a number of manual changes to ensure the project still functions.

**Describe the solution you'd like**
I see one of two options:
1. the solution unique name can be overridden in the `solution.json` file (this would require additional work to ensure it is used everywhere)
2. update the generator to ask if the solution exists and what the solution unique name is (this is less intrusive)

**Describe alternatives you've considered**
Please see above (manual and two solutions).