Python BS + Mapmerge changes

tools/bootstrap/python.bat

@@ -1 +1,2 @@
-@call powershell.exe -NoLogo -ExecutionPolicy Bypass -File "%~dp0\python_.ps1" %*
+@echo off
+call powershell.exe -NoLogo -ExecutionPolicy Bypass -File "%~dp0\python_.ps1" %*

tools/bootstrap/python37._pth

@@ -1,4 +1,4 @@
-python36.zip
+python37.zip
 .
 ..\..\..
 

tools/bootstrap/python_.ps1

@@ -50,7 +50,7 @@ if (!(Test-Path $PythonExe -PathType Leaf)) {
 	[System.IO.Compression.ZipFile]::ExtractToDirectory($Archive, $PythonDir)
 
 	# Copy a ._pth file without "import site" commented, so pip will work
-	Copy-Item "$Bootstrap/python36._pth" $PythonDir `
+	Copy-Item "$Bootstrap/python37._pth" $PythonDir `
 		-ErrorAction Stop
 
 	Remove-Item $Archive