Update solution to convert tabs to spaces.

The default source formatting appears to use spaces and not tabs. This updates the solution file with this setting to be consistent.
Raise a managed exception if the Class was not found during construction.

Previously the Id constructor might send a null pointer through SendMessage which was harder to debug.
Add support to configure the SDK version (assembly linkage).

This allows compilation using mscorlib v2 for example.
Raise exception for NULL domain.

A null domain can occur if mono_domain_get() is called on a thread unattached to a domain. This makes it easier to diagnose.
Register all ObjectiveCClass types in an assembly.

Previously only exported (e.g. public) types were registered. However, it is sometimes useful to register non-public Mono types with ObjectiveC for interop purposes while keeping the Mono type hidden from API consumers.
Workaround for Mono recursion bug when loading assemblies.

Some versions of Mono enter a recursive loop if accessing the assembly name or type from within AssemblyLoad. This works around that by specifically checking for mscorlib or System and aborting early.

This approach forces assembly loading. The iOS sim didn't load System.dll without it.
Use the ASL logging facility instead of printing to standard output. The logs now appear in the Console application.
Merge branch 'hotfix/null-class-exception' of https://github.com/spicypixel/monobjc into spicypixel-hotfix/null-class-exception
Merge branch 'feature/mono-sdk-option' of https://github.com/spicypixel/monobjc into spicypixel-feature/mono-sdk-option
Merge branch 'hotfix/register-all-types' of https://github.com/spicypixel/monobjc into spicypixel-hotfix/register-all-types
Merge branch 'hotfix/null-domain-check' of https://github.com/spicypixel/monobjc into spicypixel-hotfix/null-domain-check
Change the wording.
Merge branch 'hotfix/load-assembly-recursion' of https://github.com/spicypixel/monobjc into spicypixel-hotfix/load-assembly-recursion
Remove unused import.
Add domain and thread information.
Enable command-line override for OSX versions to build.
Fix SecurityInterface.Tests build in csproj.

The project would not build because the explicit reference to Monobjc.Security and Monobjc.SecurityFoundation conflicted with the implicit references from Monobjc.SecurityInterface.
Fix or ignore expected compiler warnings.
Fix #411.
Merge branch 'spicypixel/public/hotfix/remove-security-ref' of https://github.com/spicypixel/monobjc into spicypixel-spicypixel/public/hotfix/remove-security-ref