Related to #5841.

Fixes #4097.

Fix GetDiagnostics(span) to return all diagnostics intersecting the span, rather than just the diagnostics contained within the span.

Fixes #3892 and #4559

Fix FileCodeModel's usage of CleanableWeakComHandleTable when an a key is in the table but the value is null

Updating System.Reflection.Metadata to 1.1.0-alpha-0015 and System.Collections.Immutable to 1.1.37.0

Revert "Updating System.Reflection.Metadata to 1.1.0-alpha-0015 and System.Collections.Immutable to 1.1.37.0"

This reverts commit d78dbb97.

Updating System.Reflection.Metadata to 1.1.0-alpha-0015 and System.Collections.Immutable to 1.1.37.0

These strings should not be localized.

Reverting System.Collections.Immutable back to 1.1.36 until we can upgrade System.Reflection.Metadata simultaneously

See #5800 for a report of the broken tests.

Revert "Replace the conditional weak table in the analyzer driver with a weak reference to the cached data."

This reverts commit a2a8e14f.

This is a temporary work-around to prevent Interactive dlls from getting
loaded when typing regular C# files.  I'm currently working on a better
fix that uses a new [ContentType("CSharp Script")] for .csx and REPL.

Updating Microsoft.DiaSymReader to v1.0.6, Microsoft.DiaSymReader.Native to v1.2.0, and System.Collections.Immutable to v1.1.37

1. added tests for auto line ender after open and close braces in block
syntax and non-block syntax scenarios.

2. make the fallthrough to editor case check that caret is between open
and close brace.

...by treating it as Enter where user can unintentionally have
Shift key pressed while hitting Enter.

In cases of pressing shift+enter after typing open parenthesis to open a block, assuming brace completion is on, we produced code like this:

initial:
```C#
try { |}
```
final:
```C#
try { }
|
```
basically, in such a case, we didn't have anything to complete the line (like a semicolon that we need to insert), yet we handled it anyway and inserted a Newline after the block and positioned caret on the next line.

a better output here could be what we produce on enter:

```C#
try
{
    |
}
```

the implementation is simple: detect cases like this and delegate the command to the editor whose default implementation is exactly what we need.

This will ensure that if we have two anonymous type properties from the same
compilation, that they will be considered the same if the compiler thinks they
are the same.

Fix "Suppress Active Issues" for project/solution command to use the diagnostics directly from the diagnostic service, instead of the error list. This has multiple benefits:

1. We don't need to wait for error list to be force updated to start computing the suppressions fix. It can take quite a while for error list to reach to stable state

2. We don't do unneccessary mapping from error list entry to roslyn diagnostic snapshots and also don't need to do any filtering of stale diagnostics.

Fixes #5725.

Temporarily add System.Runtime facade reference explicitly, since the host object moved to portable lib

Fixes #5734