Also this commit adds AbstractTwoAttributesMetaInfoProcessor which can
  be used for reporting diagnostics with two attributes (OI/NI, PSI/Light tree)

Update includes:
- Changing syntax of `OI/`NI` tags from `<!NI;TAG!>` to `<!TAG{NI}!>`
- Fix some incorrect directives
- Change order of diagnostics in some places
- Remove ignored diagnostics from FIR test data (previously `DIAGNOSTICS` didn't work)
- Update FIR dumps in some places and add `FIR_IDENTICAL` if needed
- Replace all JAVAC_SKIP with SKIP_JAVAC directive

#KT-43687 Fixed

This is a direct port of JavaAnnotationMapper from the old frontend.

#KT-43616 Fixed

but not for value classes.
Since inline classes and value classes share the same flag, we use
presence of the annotation to distinguish them.

Non-const properties may need them too with if the 1.4 feature
NoConstantValueAttributeForNonConstVals is disabled.

#KT-43332 Fixed

Before this commit, questionable optimization existed which
unwrapped string interpolating call with single argument to this argument.
However, this led to source element loss and the necessity of sub-hacks.
In this commit we dropped this optimization (anyway user can remove
this single-expression string template in code if needed) to keep
source elements intact.

Also that fixes some bugs

Use stubReceiver as a receiver for fake calls

See issues KT-43358 KT-43359 KT-43378

- Put extensionReceiver to candidate even if it's explicit (for sake of clarity)
- Split CheckReceiver (dispatch part should only check nullability)

Do not try to integrate/postpone receiver expression to the base system
Receiver should be resolved independently anyway

`overriddenMembers` contract requires original (non-enhanced) function
See other usages

Ignored tests have been working accidentally

^KT-43289 Open

This is needed to avoid clashing name of generated test class (`Nested`)
  with annotation @Nested from JUnit 5

Previously helpers from checkType.kt was in special package, and
  if directive was enabled then test runner (`AbstractDiagnosticTest`)
  injected additional imports to test files and removed them after test
  was completed.
It's very hard to support such behavior in new test infrastructure so
  there was a decision about changing `CHECK_TYPE`:
1. All helpers from `checkType.kt` now stays in default package
2. `CHECK_TYPE` only adds `checkType.kt` to set of analyzed files
      and don't modify their content

For test which are written in default package (most of tests actually)
  there are no changes. On the other hand if there is a test where dev
  want to use checkType functions in testfile with some package then he
  should explicitly import functions which he needed (`checkSubtype`,
  `checkType`, `_`)

#KT-39709 Fixed
#KT-43156 Fixed

This commit includes three changes:
1. 'EnhancedNullability' is no more set for declaration types
2. It is no more used for conversion types in translator
3. Translator inserts implicit not-null cast only when enhanced type is cast to not-null type.

Companion as qualifier should be found at static scope not a member one

They are not SubstitutionOverrides anymore

UPPER_BOUND_VIOLATED for type alias constructors is not supported properly
See KT-43142

In init block or property initializers,
for `val x` declared in primary constructor,
`x` reference is now resolved to property, not to parameter.
So we need two different scopes for primary constructor,
one for 'pure' parameters and another one for all parameters,
including val/var ones.

#KT-42844 Fixed