Add _ROR & _ROL support. Fix issues with _SHR & _SHL

[a740g]

@SteveMcNeill @mkilgore @RhoSigma-QB64

Opening a PR for _ROL and _ROL functions for QBPE-64.
These are implemented using multiple C functions on the LibQB side. However, they are mapped to _ROL and _ROL on the BASIC side.

@mkilgore You had mentioned an issue with _SHL where shifting bits left beyond say a byte would spill those to the word side.

I've implemented _SHR & _SHL just like _ROL and _ROL now and the issue above is now fixed.

Update: All _SHL & _SHR specific changes have been removed from this PR as some critical things will need to be considered and behaviors defined.

[mkilgore]

IMO it would be good to add a bunch of test cases of the expected results of these functions, it would give us a good idea of how they behave (especially with type conversions) and also highlight any potentially incompatibilities with the existing _SHR and _SHL. These should be pretty easy to do, just create a ./tests/compile_tests/shifts folder and inside create a test.bas and test.output. In test.bas you can do a bunch of tests like this:

$CONSOLE:ONLY

Dim b as _Byte
DIm i as _Unsigned Integer
b = -2
i = &HAA00

PRINT _SHR(b, 2); _SHR(b, 8); _SHR(b, 20); _SHR(b, 70); _SHR(b, -1)

FOR k = -100 to 100
    PRINT _SHL(i, k); _SHR(i, k)
NEXT k

' More tests, you get the idea

And then test.output should just contain the expected console output of the program:

10 20 30 40 50
1 2
2 3
3 4
...

Obviously those numbers aren't right, but I hope it makes enough sense :) I'd be happy to help you get stuff in place if you want. For checking it locally you can just compile your test program and run it. Additionally you could make another ./tests/compile_tests/rotations for testing _ROL and _ROR.

Ideally the _SHR and _SHL tests produce the same output on the current QB64 as they do on the fixed version, but I suspect that won't be the case. The tests would help us understand the differences.

[RhoSigma-QB64]

In subs_functions.bas the names assigned to id.n = should reflect the correct "CaMeL" case, as these are used to determine the correct casing if "Camel Case" is set in IDE>Options>CodeLayout, hence _RoL and _RoR or _Rol and _Ror.

In the same run _SHL and _SHR should be corrected and all other which are not normalized for CaMeL case.