* 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 There are still some warnings about outdated APIs in use, but they are non-trivial changes to fix.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
- The issues in #1038 are not explained.
- In `ASCollectionViewTests` do not mock every `collectionViewLayout`, only do it for the test that requires it. In addition, call `-stopMocking` when done. OCMock 3.6 found this code using stuff after it should have been.
- 5c42bb4e2f says the layer tests are not typically run, but they are in the project. That diff refers to ASUIViewTests being skipped, but those tests do not exist. So I've just disabled them in this diff. It is not clear how they ever worked.
* Apply recommended warnings
* Squelch designated initializer warning in ASViewController
* Remove unused compiler flag
clang: warning: argument unused during compilation: '-fno-objc-arc-exceptions' [-Wunused-command-line-argument]
* Fix warning about overriding an instance variable within a category
Instance method 'methodOverrides' in category from _ASDisplayView.o overrides method from class in ASDisplayNode.o
* Faster collection operations
* Fix a few things
* Put the stupid semicolon
* Address warning
* Cut down retain/releases during collection operations
* Update CHANGELOG.md
* Perhaps controversially, decomposing ASRangeControllerUpdateRangeProtocol+Beta.h such that the categories on various classes are defined in the classes themselves since that's where the implementation of those categories is provided.
* Updating unit tests and import other headers the tests took for granted. The tests could probably import the umbrella header and not have to worry about this.
* Updating the "Life without Cocoapods" sample to build and run dependent on ASDK as a static library.
* Added a "Life With Frameworks" sample app to build and run dependent on ASDK as a framework, proving the framework targets work.
Andy Finnell
Greg Bolsinga
Eric Jensen
Adlai Holler
Adlai Holler
Huy Nguyen
Kiel Gillard
Levi McCallum
Scott Goodson
Scott Goodson
Roy Marmelstein
Nadine Salter