IntelliJ plugin, Gradle, Kotlin, Java version upgrade

[denis-fokin]

Description

Buch of libraries have been updated. Kotlin, Java, Gradle versions are upgraded. The change is a breaking one. Some of Kotlin implementation is changed because of backward incompatible changes in the language. The Gradle version introduced a number of more strict requirements, by this reason, some Gradle scripts are upgraded. There are some changes to distinguish different versions of Java used to bootstrap concrete executor. Some problems are still unresolved but they were not considered blockers for the transition (Such issues are marked with "Java 11 transition" as a commentary or as an annotation).

Fixes # (749)

Type of Change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Automated Testing

All tests have been executed on CI.

Manual Scenario

No specific manual scenario. The change potentially affects all UnitTest functionality.

Checklist (remove irrelevant options):

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• New tests have been added
• All tests pass locally with my changes

[github-actions]

Unit Test Results

0 tests   0 ✔️  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit 3f8c338.

♻️ This comment has been updated with latest results.

[dtim]

It seems to work :).