Implement bitwise operators

[rehelmin]

The code in this pull request adds implementations for the following bitwise operators:

• And
• Or
• Xor
• Not
• Bit shift left
• Bit shift right

Note that typically used '^' character for xor currently clashes with the power operator in numbat, so I have used the more cumbersome to type, but unique ⨁ character for performing the xor operation.

[Goju-Ryu]

Note that typically used '^' character for xor currently clashes with the power operator in numbat, so I have used the more cumbersome to type, but unique ⨁ character for performing the xor operation.

That sounds like a reasonable solution. I think it would be good, having an xor keyword in addition, to make it less cumbersome.

[rehelmin]

Updated. I'm not sure why all the builds are all failing now though? I'm able to build it just fine on my workstation.

[Goju-Ryu]

Thank you. I think the failing builds are related to #752. It should be an easy fix, which I can look into tonight.

[Goju-Ryu]

I fixed the error, added documentation and updated the add-in. I also changed the tokenizer implementation slightly to use the keywords map instead of custom parsing for the xor keyword.