Consistent case for arguments

[tomdurrant]

Currently the schism namelist files have a mix of upper and lower case variable names. This doesn't matter at runtime as Fortran is case insenstive. Python is not. To avoid confusion, and as a syle decision, I propose we enforce lowercase variable names

[tomdurrant]

Note that we have the option to make inputs themselves case insensitive.

class Settings(BaseSettings):
    redis_host = 'localhost'

    class Config:
        case_sensitive = True```