KT-1810 "defined in" in completion list takes space that could be used for more useful information - replaced to "in"
 #KT-1810 fixed

 #KT-1673 fixed

 #KT-1805 Fixed

- Analyze is reference variant is suitable for completion before creating LookupElement
- Show visibility icon in completion list for kotlin declarations

 #KT-1756 fixed

 #KT-1645 fixed

 #KT-1755 fixed

 #KT-1644 fixed

This reverts commit 3c45a1d6.

This commit breaks compilation of jdk-headers. Explanation:

1. TopDownAnalyzer creates namespace java.util from sources
2. TopDownAnalyzer creates class Map in java.util
3. TopDownAnalyzer processes import java.util.Map.Entry
4. JavaDescriptorResolver resolves namespace java.util.Map
5. java.util.Map namespace is added to java.util namespace
6. redeclaration handler of namespace java.util crashes on Map

 Completion testing framework extended with ability to assert tail text.

- refactoring for auto import tests

KT-1316 Type name completion inserts fully qualified name when works in incomplete code

KT-1151 Code completion for not imported extension functions - test for completion not-imported function on nullable type

KT-1151 Code completion for not imported extension functions - more tests for extension functions and properties

KT-1151 Code completion for not imported extension functions - test for completion extension function without params

- Remove duplicated test

- Disable class level keywords from method parameters list
- Reorganize completion tests to separate methods

- Icon for java fake class

- Stubs elements are enabled
- Changed method for selecting indexing policy for plugin and compiler
- Quick fix for import unresolved top-level function added

1. namespace class should not be accessible from Kotlin despite the fact we don't have kotlin class descriptor for it.
2. testdata is corrected due to the fact frontend has wrong qualified name in trace for root namespace