Core, CI: Add Python 3.12 support (#3290)

* Core, CI: add py3.12 compat

* Stardew Valley: Fix tests for Py3.12

* ModuleUpdate: always install pkg_resources

* Docs: update supported python versions

* WebHost: update pony to upstream 0.7.18

* CI: test hosting update to py3.12

* Update docs/running from source.md

docs/running from source.md

@@ -8,7 +8,7 @@ use that version. These steps are for developers or platforms without compiled r
 
 What you'll need:
  * [Python 3.8.7 or newer](https://www.python.org/downloads/), not the Windows Store version
-   * **Python 3.12 is currently unsupported**
+   * Python 3.12.x is currently the newest supported version
  * pip: included in downloads from python.org, separate in many Linux distributions
  * Matching C compiler
    * possibly optional, read operating system specific sections
@@ -31,7 +31,7 @@ After this, you should be able to run the programs.
 
 Recommended steps
  * Download and install a "Windows installer (64-bit)" from the [Python download page](https://www.python.org/downloads)
-   * **Python 3.12 is currently unsupported**
+   * [read above](#General) which versions are supported
 
  * **Optional**: Download and install Visual Studio Build Tools from
    [Visual Studio Build Tools](https://visualstudio.microsoft.com/visual-cpp-build-tools/).