Changes in .2943 since .2937

Core

E26840: Allow nullable cast operators for value types
E26929: C#: assigned/else doesn’t unwrap nullable
E26918: Cannot use InsstanceType in cast operator
E26981: CC: for C# & co, insert () when completing CC
E26993: Class Completion (Ctrl+Shift+C) loses not nullable keyword
E26984: Compiler/Island: ArgumentNullException at IslandObjectModel.BuildVMT: do not generate anon method classes with classModel = COM
E26980: Debugger/Darwin: can’t see elements of NSArray
E26991: Debugger: CLR: bad local after switching frames
E26989: Debugger: Show obfuscated members as normal
E26995: Generic result is not properly enforced with InstanceType
E27011: Go: No member Ref on type go.builtin.int
E26986: Improve error, include module information, when using the same type but from different references
E26896: Island/Delphi: wrong name for nested class
E26979: Oxygene: self shouldn’t be assignable
E26982: Untyped var fails to compile (good) but using its later causes IE
E26975: Water: cannot run Mono debugger on arm/Mac
Debugger: CLR: get exception message even if no frames for thread
Echoes: Add missing WebForm item template
Merged CodeGen4
Merged EBuild
Merged ROCodeGen
Merged RTL2
Multipart CC adds its parts on the next line
Multipart CC inserts its parts inside ()
Oxygene: bad wrong indent warning for else in the same line
ship .fx in Just Symbols archive
ship .obfuscation-map in Just Symbols archive

F297: Readonly background right after creating new project
E27007: Water: canvas code doesn't change after removing selected file from project
E26998: Water: problem with empty window
Debugger: Highlight current thread with red icon, just like current stack frame
DebugHost could not start when using a relative path
Water: disable option for Mono debugger, on arm64
Water: NRE opening specific project

.NET Core: Don't regenerate .json files if not necessary.
.NET Core: Don't regenerate AppHost if not necessary.
.NET Core: resolve references specific to a known framework platform (eg “win” and version
.NET Core: resolve references specific to a known framework platform and version
.NET Core: resolve references specific to a known frameworkplatform and version
.NET Core: support for handling framework platfiorm and version better
.NET Core: support for handling framework platform and version better
Merged ROCodeGen
NuGet: Don't fail if a package repository cannot be resolved/connected to; just continue to next
Per-target OutputPath setting was ignored
Per-target OutputPath stting was ignored
Temp fix for Gzip being broken on Mono

Added more nullable annotations
DateTime and Guid: better support for casting to/from with nullable platform value types
Marked Guid and DateTime as readonly classed
New HttpFormRequestContent class