Release of v7.2.0

Add `KillProcess` and `WaitPid` functions to libpsl (PowerShell#63)

v7.2.0-preview.1 release of PowerShell-Native

v7.1.0 release of PowerShell-Native

v7.1.0-rc.2 release of PowerShell-Native

Release of Microsoft.PowerShell.Native v7.0.0

Release of Microsoft.PowerShell.Native v7.0.0-rc.1

Release v7.0.0-preview.4

Release v7.0.0-preview.3

Release v7.0.0-preview.2