Replace roaring{,64}_bitmap_of with roaring{,64}_bitmap_from macro

[Dr-Emann]

Using a macro allows us to count the number of items passed, and avoid having to explicitly pass the count as the first parameter.

[Dr-Emann]

Ah.. looks like maybe this wont work at all with msvc:

a parenthesized type followed by an initializer list is a non-standard explicit type conversion syntax

[lemire]

@Dr-Emann Let us see...

[lemire]

@Dr-Emann The problem is that the construction does not work in C++:

https://godbolt.org/z/4YrcYMEWT

msvc is happy to compile it in C:

https://godbolt.org/z/dcazf1rGM

[lemire]

I think that this can work, one just needs to use different code when in C++. I can issue a PR against your PR if you don't immediately understand the issue.

[lemire]

Fantastic work.