Measure cpu time

[Dennis]

On Friday, 7 May 2021 at 08:52:13 UTC, Dennis wrote:
> If you want to use it on Windows as well, this is a code 
> snippet I wrote for that:

For completeness, the imports it uses:
```D
version(Windows) {
	import core.sys.windows.windows;
	import core.sys.windows.psapi: PROCESS_MEMORY_COUNTERS, 
GetProcessMemoryInfo;
} else version(Posix) {
	import core.sys.posix.sys.resource: rusage, getrusage, 
RUSAGE_SELF, timeval;
} else {
	static assert(0, "unsupported platform");
}
```