When reading, create the local equivalent of a dataclass, so that access
doesn't require ["foo"] key syntax.
Also implement the copy protocol, so that we can safely make clones of
the references returned by the ListModel.
As discussed on Reddit, the magic import logic is not very tool friendly and a little too magic perhaps. Instead, this patch introduces an automatic loader (`slint.loader`), which can traverse `sys.path` and lazily load `.slint` files by attribute lookup.
Closes#4856
Updated the version from 1.1 to 1.2
Renamed the header to "Slint Royalty-free Desktop, Mobile, and Web Applications License"
Added definition of "Mobile Application" and grant of right
Moved "Limitations" to 3rd section and "License Conditions - Attributions" to 2nd section
Added flexibility to choose between showing "MadeWithSlint" as a dialog/splash screen or on a public webpage
Moved the para on copyright notices to section under "Limitations"
A MSRV update is required to update the image crate to 0.25, otherwise
we get link error that are ficed in newer version.
Also other dependency update such as env_logger needs a newer MSRV.
Update to 1.73 because it has functions like `with_borrow` on thread
storage which we already actually use in some platform.
This is also the last release before the the drop of macOs < 10.12
in Rust 1.74
