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"
... and to use an external compiler
For example, this is how one only build the compiler:
```
cmake .. -DSLINT_BUILD_RUNTIME=OFF -DCMAKE_INSTALL_PREFIX=/tmp/slint_compiler
make install
```
And this only build the runtime
```
cmake .. -DSLINT_FEATURE_COMPILER=OFF -DCMAKE_INSTALL_PREFIX=/tmp/install_runtime
make install
```
And then this can be used in a project like so:
```
cmake .. -DCMAKE_PREFIX_PATH=/tmp/install_runtime/ -DSLINT_COMPILER=/tmp/install_compiler/bin/slint-compiler
```
With the latest Corrosion update test binaries don’t depend on libslint_cpp.so with path anymore that contains a slash. Therefore rpath kicks in and this workaround should not be needed anymore.
Plus, this gives us test coverage for rpath.
