Default policies

[gaya-]

@fairlight1337 Are you sure we want to have the implementation of default policies in cram_core? In my opinion the cram_core has only the definition of the language and how you use it is of no concern to cram_core. So, the timeout-policy is an implementation-specific thing, I would move it to cram_highlevel into the plans. That would also help to get rid of the "unused function TIMEOUT-POLICY" note :)

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