Fix memory leaks around slang-test (shader-slang#757)

* Remove circular reference to renderer on Vk & D3D12 DescriptorSetImpl

* Refactor Stbi image loading such that memory is correctly freed when goes out of scope.
Added Crt memory dump at termination.
Reduced erroneous reporting by scoping TestContext.

* Used capitalized acronym for STBImage to keep Tim happy.

* Split out TestReporter - to just handle reporting test results
Split out Options
Made TestContext hold options, and the reporter
Removed remaining memory leaks.

* Small optimization for rawWrite, such that it directly writes over print..

* Improve comments on TestCategorySet

* Fix typos in TestCategorySet

Author: jsmall-zzz

slang.sln

@@ -1,8 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
-VisualStudioVersion = 14.0.25420.1
-MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "examples", "examples", "{EB5FC2C6-D72D-B6CC-C0C1-26F3AC2E9231}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "hello-world", "examples\hello-world\hello-world.vcxproj", "{010BE414-ED5B-CF56-16C0-BD18027062C0}"

source/core/slang-writer.h

@@ -14,7 +14,7 @@ class WriterHelper
 public:
     SlangResult print(const char* format, ...);
     SlangResult put(const char* text);
-
+    SLANG_FORCE_INLINE SlangResult write(const char* chars, size_t numChars) { return m_writer->write(chars, numChars);  }
     SLANG_FORCE_INLINE void flush() { m_writer->flush(); }
 
     ISlangWriter* getWriter() const { return m_writer;  }

source/slang/slang.vcxproj.filters

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <Filter Include="Header Files">

tools/slang-reflection-test/main.cpp

@@ -18,7 +18,8 @@ struct PrettyWriter
 
 static void writeRaw(PrettyWriter& writer, char const* begin, char const* end)
 {
-    Slang::AppContext::getStdOut().print("%.*s", int(end - begin), begin);
+    SLANG_ASSERT(end >= begin);
+    Slang::AppContext::getStdOut().write(begin, size_t(end - begin));
 }
 
 static void writeRaw(PrettyWriter& writer, char const* begin)