Processing function shouldn't contain UI calls

[dkushche]

The processing function should be able to be used by other software. This software won't need to init interface which is part of crypto UI, so all cterm calls shouldn't be in the processing function.

Example:

def cryptoapi_aes_processing(data, key_length, key,
                            mode, provider, encrypt):

    if platform.system() != "Windows":
        return f"Unsupported on your platform {platform.system()}"

    cryptoapi_aes_pre_processing(key, key_length)

    if provider == "standard":
        result = crypto_native.ms_cryptoapi_standard_aes(
            data, key, encrypt
        )
    else:
        result = crypto_native.ms_cryptoapi_nextgen_aes(
            data, key, mode, encrypt
        )

    crypto_tools.cterm("output", f"Hashed key: {result['hashed_key']}", "inf")
    crypto_tools.cterm("output", f"Session key: {result['session_key']}", "inf")

    return result["result"]

If I try to import cryptoapy_aes and call just its processor I will get an Exception because the color palette for cterm is not defined.