rename/alias scenario specific config entries

[nilsbehlen]

The config values are hard to understand. Therefore,
On the base of the current documentation

These entries expect a REG_SZ, that consist of a digit 0, 1, 2, 3 and a character "e" or "d".

    0: relevant for remote (RDP) and local operation
    1: relevant for remote operation
    2: relevant for local operation
    3: the privacyIDEA Credential Provider will not be shown in remote and local operation.

The characters stand for:

    "e": Only the privacyIDEA Credential Provider is available. All other credential providers are not available.
    "d": The privacyIDEA Credential Provider will be available in addition to all other Credential Providers on the machine.

the values could be alias to something that can be understood, like:
cpus_credui = remote_filter / local_nofilter