Cardstock

This release just fixes a few sneaky bugs that hitched a ride with v0.9.

--------------------

Despite being a pre-1.0 release, this is a big one. It includes:

Drawing:
=======
- Flipped the stack canvas vertically, so that the positive direction is up, and the origin is the bottom-left corner. (Old stacks will be auto-migrated for you, at least for initial layout. You may still need to manually update any code that sets object positions.)
- A new Polygon drawing tool
- Allow resizing objects from all 4 corners
- Draw Text Labels ourselves now, so they no longer have opaque backgrounds on Windows

Coding:
======
- Basic autocomplete in the code editor, for the names of objects, methods, properties, and user-created functions and variables
- Live syntax error underlining in the code editor
- Animations to the same property of an object now chain by default, so you can trivially set up multi-stage animations
- Rename OnIdle() handlers to OnPeriodic() (Old stacks will be auto-migrated for you.)
- Even more example stacks

Other:
=====
- Major performance improvements, especially under Windows.
- Loads of bug fixes and UI/UX cleanup

- Adds a new Output tool window, that will show any console output or error messages from the running stack. It automatically opens on the first output.
- Big under-the-hood change - now runs a stack's event code on a dedicated thread, while pushing all UI calls back to the main thread. This enables users to quit a program stuck in an infinite loop, and CardStock Designer will even tell you which event on which object was stuck.
- Lots of bug fixes

Allow bundling extra included python modules when exporting a stack, when running from source

Fix bug with name deduplication

fix resource handling in prebuilt Designer app