fix proplib deprecation

add panic.kmod, an easy way to trigger a panic. takes a 'how' argument
to specify how to trigger the panic:
modload -s how=panic panic.kmod <-- just calls panic()
modload -s how=nullptr panic.kmo

add panic.kmod, an easy way to trigger a panic. takes a 'how' argument
to specify how to trigger the panic:
modload -s how=panic panic.kmod <-- just calls panic()
modload -s how=nullptr panic.kmod <-- null ptr deref
if how isn't specified, it defaults to 'panic'. feel free to add more.

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