IDEA-CR-19891 Shell scripts: fixed the cases when boot jdk action file or env. vars point to not existed jre.
check JDK_HOME using by the new isJDK function.

an assertion to detect some cases of stub element types being not mentioned in "stubElementTypeHolder" extensions

made quickfix no longer visible when applied to fix IDEA-170081 Inspection "Collapse 'if' statement" generates wrong code when quickly fixing the code

IDEA-CR-19891 Shell scripts: fixed the cases when boot jdk action file or env. vars point to not existed jre.

Allows moving and renaming optional components. Without the fix, an empty directory tree would be created when an optional component is missing from an installation being patched.

Update PyTypeChecker to always use substitutions while matching types.

Gradle: handle progress events for all interactions with gradle including getting BuildEnvironment model.
Otherwise we can miss gradle tooling client side events like distribution download.

E.g. "The specified Gradle distribution 'https://services.gradle.org/distributions/gradle-version-bin.zip' does not exist."
The error message should be shown for import project and for task execution

test failures caused by incompatible platform guava library which pollutes the classpath (and hence the guava from gradle plugin ignored). The issue affects only test and running IDEA using IDEA. Testing of 1.x should be enabled when the proper plugin classloader will be used for tests

avoid apache libs version conflict for aether module: use httpclient and commons-codec implementations from the IDE distribution