Rename uint alias to prevent name collision with Qt

[Bruflot]

Qt defines some global typedefs - one of which being uint - which causes a name collision when using Qt alongside fmtlib. Although this isn't fmtlib's fault, I think it's a common enough problem that it warrants a fix.

[vitaut]

Thanks for the PR but typedefs shouldn't cause collisions with locally defined symbols.

[Bruflot]

MSVC has a warning for precisely that:

https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-4-c4459?view=msvc-170

It's enabled by default when you compile with /W4. We would disable warnings for fmtlib if we could, but since the warnings stem from a header it's easier said than done.

[vitaut]

You can suppress a warning with FMT_SYSTEM or other means.

[Pokechu22]

Note: an equivalent PR was merged: #3137