Update dependencies to their heads (#5091)

Commit list for xamarin/Xamarin.MacDev:

* dotnet/macios-devtools@49a17b1 VSTS 702327: Launch image sizes for iPhone XS Max and iPhone XR (#35)
* dotnet/macios-devtools@95599c5 Added new Xcode10 Watch Complication values (#34)
* dotnet/macios-devtools@59b15be Use Version.TryParse
* dotnet/macios-devtools@2dd5fa0 Merge pull request #32 from xamarin/vsts-692176
* dotnet/macios-devtools@a97390f VSTS-692176: Add missing AutoFill Credential Provider entitlement
* dotnet/macios-devtools@19b14f6 Added API to get the recommended Xcode version value

Diff: dotnet/macios-devtools@39ea45b...49a17b1

Commit list for mono/mono:

* mono/mono@4d7b7ab3751 [ci] Fix Windows .msi build
* mono/mono@21dc7470bc7 [bcl] avoid false pinning in GCTest (#11534)
* mono/mono@d9779c1df6d [interp] accept typed-by-ref as return type from a JIT call (#11538)
* mono/mono@e7e14a79297 [interp] transform delegate invoke in method body too (#11549)
* mono/mono@cadeaf43dad [ci] Switch to new syntax of Azure Storage plugin

Diff: mono/mono@709b46e...4d7b7ab

Commit list for xamarin/maccore:

* xamarin/maccore@e73094e632 Update maciostools to head (#1117)
* xamarin/maccore@4902ebbdbd Merge pull request #1105 from xamarin/swift-o-matic-optional-virtual-constructor
* xamarin/maccore@76ecea4760 Added IsOptional property.
* xamarin/maccore@77d93295bd Added a test where the init fails to ensure both paths work.
* xamarin/maccore@3d989b1ca4 Support for optional constructors in virtual classes.
* xamarin/maccore@bfdc782d0e Merge pull request #1100 from xamarin/swift-o-matic-constructor-mulligan
* xamarin/maccore@cf8025724d Added field and prop for ClassHandle
* xamarin/maccore@dc2e3f32fe Trimmed down ObjC constructors.
* xamarin/maccore@b53827c151 [SoM] Document CI a bit. (#1101)
* xamarin/maccore@46d01c8c10 [SoM] Provision XI and Mono as well. (#1099)
* xamarin/maccore@b4455eafcb bye bye old code.
* xamarin/maccore@34730dfeac Lots of changes for constructor refactoring.
* xamarin/maccore@bd09006725 Merge pull request #1096 from xamarin/swift-o-matic-required-init
* xamarin/maccore@2af91dc79a Label those asserts!
* xamarin/maccore@ea5b501a47 It looks like cmake isn't there?
* xamarin/maccore@b50285719f Support for required init methods
* xamarin/maccore@6e7187da41 [install-qa-provisioning-profiles] Create directory before trying to create files in it. (#1095)
* xamarin/maccore@8addb4a338 Merge pull request #1092 from xamarin/swift-o-matic-objc-methods
* xamarin/maccore@9dc7111497 Removed dead code, added nfloat.
* xamarin/maccore@663279065d Removed dead code.
* xamarin/maccore@3852918abc Added code to import C# methods defined in ObjC bindings.

Diff: https://github.com/xamarin/maccore/compare/b35c3a8d7682c8482c7c749d7c1670b3d4bbed5c...e73094e6322531bcefdef95b4ec8654f596c4ae9

Author: spouliot

external/Xamarin.MacDev

@@ -1,5 +1,5 @@
 ifdef ENABLE_XAMARIN
-NEEDED_MACCORE_VERSION := b35c3a8d7682c8482c7c749d7c1670b3d4bbed5c
+NEEDED_MACCORE_VERSION := e73094e6322531bcefdef95b4ec8654f596c4ae9
 NEEDED_MACCORE_BRANCH := master
 
 MACCORE_DIRECTORY := maccore