Feature/add some kstdlib functions

[alkuzin]

No description provided.

[NotYourFox]

Okay, so, first of all: don't forget to sync your forks before making changes to avoid conflicts and wasted work, as with your case kstdint was entirely removed in @0Nera's MR #24
And second: I did already add .vscode to .gitignore in MR #23 for the exact same reason. So, again, sync your forks, you are not the only contributor!

Regarding your commit to kstdlib.h, I think it is better to use macros for things like bytes_to_bits (and vice versa) and clear/set/test bit functions, as there is little to no reason to keep them as inline functions, also acknowledging the fact that "inline" keyword is rather a hint, than an obligation to the compiler. Hence, this is not really the best practice.

[NotYourFox]

P.S. I would like to request @0Nera's attention to the latter detail before his approval of this MR, to see if the current state of is "fine enough" and if my recommendations are necessary to follow or not in this case. Still, I encourage @alkuzin to address this and judge the necessity of applying the above himself.
I would be pleased to recieve feedback on this before the merge happens.