(cherry picked from commit 94e57c35)

(cherry picked from commit 01139daf)
r=zolotov

(cherry picked from commit 13585201)

(cherry picked from commit 1b9eb510)

(cherry picked from commit d12894ec)

review: IDEA-CR-25932
(cherry picked from commit c470b2d4)

(cherry picked from commit 02125444), IDEA-CR-25947

IDEA-CR-25842
(cherry picked from commit a4683848)

- (PDF_get/set_parameter( ) and PDF_get/set_value( ))

(cherry picked from commit 1688942e)

(cherry picked from commit b7cec740)

(cherry picked from commit 1710edf9)

IDEA-180674 Gradle/Maven: "Store generated project files externally" option is ignored when creating a project from existing sources

(cherry picked from commit 03b947b1)

IDEA-180663 Gradle/Maven: odd modules are created on enabling ""Store generated project files externally" option; Throwable at ModuleManagerImpl.loadModules

(cherry picked from commit 5a5a1934)

(cherry picked from commit f24ca3d7)

(cherry picked from commit 4cb2796e)

(cherry picked from commit 242a3bdd)

(cherry picked from commit 40857d34)

(cherry picked from commit d93debdf)

Py3UnresolvedReferencesInspectionTest.testMockPatchObject fixed.

(cherry picked from commit d272b82b)

Now custom members could be unresolved in some contexts.
That fact could lead to false positives in code insight, such as unresolved references.
So you have to process such cases separately, e.g. by ignoring them.

Pass contexts to module member providers.
Fix context annotation and pass resolve context in class members providers.

No more unstubbing in Py3UnresolvedReferencesInspectionTest.testMockPatchObject.

(cherry picked from commit 542ba81a)

No more `... instanceof PsiFileSystemItem` in it.

(cherry picked from commit e9bd2ab2)

Because it's the same as item's name.
PyClassNameCompletionTest.testSubmoduleRegularImport, testSubmodule fixed.

(cherry picked from commit 3c674651)

(cherry picked from commit f98eca66)

Remove PyUtil.getAllSuperClasses.

(cherry picked from commit 551acb88)

(cherry picked from commit d197527b)

(cherry picked from commit 62d2b294)

(cherry picked from commit 55949b3e)

(cherry picked from commit 94e45d65)

(cherry picked from commit ebaa7b7e)

(cherry picked from commit d008c5c7)

(cherry picked from commit 03031838)

(cherry picked from commit a802d2a2)

(cherry picked from commit c4113116)

(cherry picked from commit 1d138944)