AppVeyor: renew github token, renamed APPVEYOR_REPO_TAG to upper case,

added vpntest.exe to test memory

.ci/appveyor-vpntest.ps1

@@ -0,0 +1,18 @@
+$ErrorActionPreference = 'Stop'
+
+# ('s', 'c', 'b', 'sm', 'cm') ??
+('s', 'c', 'b') | % {
+
+	[String] $mode = $_
+	Write-Host "testing: $mode"
+
+	$t = (Write-Output "q\n" | & .\build\vpntest.exe $mode | Select-String -Pattern 'NO MEMORY LEAKS' -CaseSensitive)
+
+	if( ($t).Count -ne 1){
+		Write-Error 'failed'
+		return $false
+	}else{
+		Write-Host 'ok'
+	}
+
+}