Feature/shared library refactor (#712)

* * Added ISlangSharedLibraryLoader and ISlangSharedLibrary
* Implemented default implementations
* Added slang API function to get/set the ISlangSharedLibraryLoader on the session
* Put function caching onto the Session - so that if the loader is chaged, its easy to reset the shared libraries, and functions

* Run premake.

* Fix problem with setting null, would cause an unnecessary function/shared lib flush.

* * Unload SharedLibrary when DefaultSharedLibrary is deleted.
* Make SharedLibrary handle unload safely if already unloaded.

* Refactor SharedLibrary, such that it becomes a utility class - simplifying it's semantics.

* Simplified ISlangSharedLibrary such that doesn't have unload and isLoaded so easier to implement.
Use updated SharedLibrary impl.

* Disable aarch64 on windows

* Premake windows files without aarch64 build.

* Moved slang-shared-library to core (so can be used in code outside of main slang)
Fixed problem in premake5 where on windows projects were incorrectly constructed

* Allowed RefObject to base class of com types
Added ConfigurableSharedLibraryLoader
Added -dxc-path -fxc-path -glslang-path
Fix problem with dxc-path not honoring it's path when loading dxil

* Added documentation for command line control of dll loading paths.

* Remove some tabbing issues.

* Change name of include guard.

1 files changed, 7 insertions, 5 deletions

diff --git a/source/core/smart-pointer.h b/source/core/smart-pointer.h
index abd7763ee..dd00acabd 100644
--- a/source/core/smart-pointer.h
+++ b/source/core/smart-pointer.h
@@ -32,23 +32,25 @@ namespace Slang
         virtual ~RefObject()
         {}
 
-        void addReference()
+        UInt addReference()
         {
-            referenceCount++;
+            return ++referenceCount;
         }
 
-        void decreaseReference()
+        UInt decreaseReference()
         {
-            --referenceCount;
+            return --referenceCount;
         }
 
-        void releaseReference()
+        UInt releaseReference()
         {
             SLANG_ASSERT(referenceCount != 0);
             if(--referenceCount == 0)
             {
                 delete this;
+                return 0;
             }
+            return referenceCount;
         }
 
         bool isUniquelyReferenced()