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"
This is not supported right now, the other elements will not be part of
the layout, and two `for` will be in the same listview, creating bad
situation with the scrollbar.
This is a warning since it would be a breaking change to make it an
error.
For example, we used a FocusScope in the StandardListView implementation so
I had to go trough one level of indirection
CC: #860
