tenatively update mms to C++17

[sapphonie]

No description provided.

[sapphonie]

alliedmodders/hl2sdk#144 needs merged first

[dvander]

/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_algo.h:3698:63: error: too many arguments provided to function-like macro invocation
    clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
                                                              ^
/home/runner/work/metamod-source/metamod-source/dependencies/hl2sdk-dota/public/mathlib/mathlib.h:635:9: note: macro 'clamp' defined here
#define clamp(val, min, max) (((val) > (max)) ? (max) : (((val) < (min)) ? (min) : (val)))

Usually we rename clamp to V_clamp in SDKs to avoid hitting this, looks like we forgot dota.

[sapphonie]

/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_algo.h:3698:63: error: too many arguments provided to function-like macro invocation
    clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
                                                              ^
/home/runner/work/metamod-source/metamod-source/dependencies/hl2sdk-dota/public/mathlib/mathlib.h:635:9: note: macro 'clamp' defined here
#define clamp(val, min, max) (((val) > (max)) ? (max) : (((val) < (min)) ? (min) : (val)))

Usually we rename clamp to V_clamp in SDKs to avoid hitting this, looks like we forgot dota.

CSGO as well and idk how many other ones.