Add bit manipulation methods

[simo498]

It adds some methods to check and set single bits. For now there aren't methods to handle multiple bits masks, and it's limited to u32 (due to the assence of a common Integer trait in rust).

Refers to #33

[guerinoni]

@simo498 here I appreciate more feedback also from @AlessandroGrassi99 and @gallottino But sure I prefer this kind of api not for a struct Bitwise but as implementation of u32 or such... In this way you can do my_number.toggle_bit(15) and this will toggle the bit 15. I have some doubt also if is better is_set/is_reset but let's discuss :D

[simo498]

@simo498 here I appreciate more feedback also from @AlessandroGrassi99 and @gallottino But sure I prefer this kind of api not for a struct Bitwise but as implementation of u32 or such... In this way you can do my_number.toggle_bit(15) and this will toggle the bit 15. I have some doubt also if is better is_set/is_reset but let's discuss :D

Yeah it's an idea. Another is to create a wrapper like Bitwise(u32). Anyway let's hear the opinion of other people on which implementation we should uses. I also think something more direct like u32::get_bit or whatever would be more readable

[simo498]

I implemented the methods to u32 directly, so they can be called by just adding use crate::bitwise::Bits, i also added rand for testing, but it can be useful in the future as well