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Introduce new functions dealing with on-the-fly compilation of code and
execution of functions with different global scope.
The `loadstring()` and `loadfile()` functions will compile the given
ucode source string or ucode file path respectively and return the entry
function of the resulting program.
An optional dictionary specifying parse options may be given as second
argument.
Both functions return `null` on invalid arguments and throw an exception
in case of compilation errors.
The `call()` function allows invoking a given function value with a
different `this` context and/or a different global environment.
Finally refactor the existing `uc_require_ucode()` implementation to
reuse the new `uc_loadfile()` and `uc_call()` implementations and adjust
as well as simplify affected testcases.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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