Fallback for external functions #47
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Add fallback for external functions
based on:
https://github.com/inkle/ink/blob/master/Documentation/RunningYourInk.md#fallbacks-for-external-functions
It is now possible to implement a dummy/error function for each external
functions. It must have been the same name and same number of arguments
and will be executed if the external function was not bind when needed.
IF the external functions will get bind later, then it will be called
the next time.
Introduces new flag:
FALLBACK_FUNCTIONto add a new executiondimension
Introduce new value type:
ex_fn_not_foundto signal failed external