* Update to Xcode 15
## Summary
We want to make Texture build with recent tools like Xcode 15. Part of this is bumping the minimum supported OS to iOS 14.
I only removed the dead code (i.e. code gated on versions older than iOS 14). There are still some warnings about outdated APIs in use, but they are non-trivial changes to fix.
## Test plan
Run all the examples. Run all the unit tests and make them pass.
* Use Xcode 15.3 so we have 17.4 simulators
* Fixing an asset catalog compiler error when building against iPhone SE
* Fix a couple of file extensions for assets
A couple of PNGs were marked as JPGs
* fix SIMULATE_WEB_RESPONSE not imported #449
* add constraint to using catching for layout
* Add TextNode example to test Yoga Layout
* update Yoga version
* add debugging log
* fix lisence
* clean up
* clean up
* fix lisence warning
* add shared scheme
* change sdk version
* revert some metadata
* Merge FlexLayoutExample to TextStressText.
Add flags to control different TextNode used.
* clean up
* fix lisence and syntax
* clean up
* remove xcworkspacedata
* Tiny coding style changes
* Another tiny change related to code style
Andy Finnell
Adlai Holler
Max Wang
Hannah Troisi