* Replace usage of 'de.fuerstenau.buildconfig'
with a custom replacement, because the plugin
does not support Gradle 7.0+ and
there has not been any commit activity in 5 years
(https://github.com/mfuerstenau/gradle-buildconfig-plugin);
* Update 'com.github.johnrengelman.shadow' to 7.0.0
`withJava()` is removed from MPP test, because our tests don't contain Java,
but the latest stable version of Kotlin fails with exceptions,
when Gradle 7.0 is used. The issue is fixed in Kotlin's master:
297aa17b6e
Previously some tests (e.g. FileHashTest) were executed
multiple times in each test task.
This change splits tests in the following way:
* `testGradle-<VERSION>` task only runs `org.jetbrains.compose.gradle.*` tests
with the corresponding Gradle version;
* `test` runs all other tests once;
* `check` runs all tests and checks;
This change removes `org.jetbrains.compose.desktop.application` plugin id
in favor of doing everything in `org.jetbrains.compose`.
The change simplifies configuring Compose Desktop projects.
Now, just one plugin dependency is needed.
To avoid task name conflicts with common task names such as `package` and `run`,
the plugin creates tasks lazily only if `application` block/property is used in a script.