Interpreter: Make signedness and narrowing conversions explicit #10041
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Makes our conversions between different signs and cases where truncations would occur to be explicit to indicate that they're intentional and, well, make implicit conversions explicit for reading purposes, which I think is preferable for the interpreter, given it essentially partially doubles as a reading reference for faster CPU backends to base behavior off of in tandem with other documenation. This also resolves numerous compiler warnings when stricter conversion warnings are enabled.
Note that we have a bunch of seemingly... old history tracing code in Interpreter.cpp, if this isn't particularly useful, I'm fine with completely removing it, since it'd make the interpreter's Run() member function a little more compact and nicer to read without the ifdefs.