Remove 'in' qualifier from extern(Windows) functions parameters

Merge pull request #7 from kubo39/patch-refactor-pagesize

Call sysconf only at once

Merge pull request #6 from kubo39/patch-1

Call sysconf() only at initialization

Add currentTotal for ProcessCPUWatcher #5

Remove support for old compilers. Remove trailing spaces

Update info about FreeBSD support in README.md [ci skip]

Add links to examples in README.md

Update README.md

Add scope(exit) to prevent FILE leakage on linux

Merge pull request #3 from majiang/implicit-string-concat

Remove implicit string concatenation (deprecated in DMD 2.072)