*Replace this paragraph with a description of what this PR is changing
or adding, and why. Consider including before/after screenshots.*
*List which issues are fixed by this PR. For larger changes, raising an
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reduce redundant work.*
## Pre-launch Checklist
- [ ] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [ ] I signed the [CLA].
- [ ] I read the [Contributors Guide].
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.
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* Tidyup `varfont_shader_puzzle`
* Add a rebuild script and a test
* Simplify fragment shaders
* Drop web
* Enable `beta` CI
* make it `beta` inclusive
* Pull out the program loading code
* Added sample code for using plugins and channels from background isolates.
* goderbauer feedback 1
* goderbauer feedback2
* goderbauer feedback 3
* Add `background_isolate_channels` to CI
* Comment in `background_isolate_channels`
* Fixup
* Elide `experimental/material_3_demo` from `master`
* Elide `material_3_demo` from `master` CI
* Elide `place_tracker` on `master` CI
---------
Co-authored-by: Brett Morgan <brettmorgan@google.com>
Co-authored-by: Brett Morgan <brett.morgan@gmail.com>
* added Type Jam puzzle app for review
* pr round 2 prep
* updated ci scripts for varfont_shader_puzzle
* resolved unused and minor variable naming issues
* rotator tiles row and col are final vars now
* removed unused import and print from production
* made constructors const where needed
* pages_flow export refactored to directly come from that file
* removed old api commented out section from FragmentShaded
* updated pubspec yaml to correct project name
* dart min version updated; removed unnecessary commented out dependencies from pubspec.yaml
* updated pubspec.yaml min flutter version to ensure FragmentShader support
* added/edited comments for explanation, esp on var fonts; removed obsolete comments
* trailing newline added to pubspec.yaml eof
