extmod/modtls: Move the native ssl module to tls.

The current `ssl` module has quite a few differences to the CPython
implementation.  This change moves the MicroPython variant to a new `tls`
module and provides a wrapper module for `ssl` (in micropython-lib).

Users who only rely on implemented comparible behavior can continue to use
`ssl`, while users that rely on non-compatible behavior should switch to
`tls`.  Then we can make the facade in `ssl` more strictly adhere to
CPython.

Signed-off-by: Felix Dörre <felix@dogcraft.de>

ports/windows/variants/manifest.py

@@ -0,0 +1 @@
+require("ssl")

ports/windows/variants/standard/mpconfigvariant.props

@@ -1,3 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
+  <PropertyGroup>
+    <FrozenManifest>$(PyWinDir)\variants\manifest.py</FrozenManifest>
+  </PropertyGroup>
 </Project>