Fix definitions of `type_min` and `type_zero` in `xr_types.h`#1510

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AMS21 wants to merge 2 commits intoOpenXRay:devfrom

AMS21:fix/xr_types_min_zero

Commits on Dec 4, 2023

xrCore: Fix definitions of `type_min` and `type_zero` and add `type_lowest`
AMS21
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Refactor: Keep old behavior changed by previous commit
AMS21
committed