Fix getUsableMemory() and getFreeSwapMemory() on Windows#209
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ullAvailPhys is the closest equivalent to Linux's MemAvailable. MEMORYSTATUSEX does not expose a separate MemFree-like value. For swap, ullAvailPageFile includes space that can be committed to physical memory, so we subtract ullAvailPhys to approximate the actual free swap space, following Zabbix's approach: https://github.com/zabbix/zabbix/blob/7.4.11/src/libs/zbxsysinfo/win32/swap.c#L130-L137 Closes CauldronDevelopmentLLC#208
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ullAvailPhys is the closest equivalent to Linux's MemAvailable. MEMORYSTATUSEX does not expose a separate MemFree-like value.
For swap, ullAvailPageFile includes space that can be committed to physical memory, so we subtract ullAvailPhys to approximate the actual free swap space, following Zabbix's approach:
https://github.com/zabbix/zabbix/blob/7.4.11/src/libs/zbxsysinfo/win32/swap.c#L130-L137
Closes #208