Update build files

* Update to newer version of Premake, 5.0 alpha 10
* Plus local changes for auto-generating props files
* Drop support for VS2012

Author: jstewart-amd

ags_sample/build/AGSSample_2012.sln

@@ -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="ags_lib">

ags_sample/build/AGSSample_2012.vcxproj

@@ -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="ags_lib">

ags_sample/build/AGSSample_2012.vcxproj.filters

@@ -16,16 +16,18 @@ workspace (_AMD_SAMPLE_NAME)
 project (_AMD_SAMPLE_NAME)
    kind "ConsoleApp"
    language "C++"
+   characterset "Unicode"
    location "../build"
    filename (_AMD_SAMPLE_NAME .. _AMD_VS_SUFFIX)
    uuid "021ECEC9-6E88-8240-B7C6-33E623706095"
    targetdir "../bin"
    objdir "../build/%{_AMD_SAMPLE_DIR_LAYOUT}"
    warnings "Extra"
    floatingpoint "Fast"
+   symbols "On"
 
    -- Specify WindowsTargetPlatformVersion here for VS2015
-   windowstarget (_AMD_WIN_SDK_VERSION)
+   systemversion (_AMD_WIN_SDK_VERSION)
 
    -- Copy DLLs to the local bin directory
    postbuildcommands { amdAgsSamplePostbuildCommands(true) }
@@ -38,11 +40,11 @@ project (_AMD_SAMPLE_NAME)
 
    filter "configurations:Debug"
       defines { "WIN32", "_DEBUG", "_CONSOLE", "_WIN32_WINNT=0x0601" }
-      flags { "Symbols", "FatalWarnings", "Unicode" }
+      flags { "FatalWarnings" }
       targetsuffix ("_Debug" .. _AMD_VS_SUFFIX)
 
    filter "configurations:Release"
       defines { "WIN32", "NDEBUG", "_CONSOLE", "_WIN32_WINNT=0x0601" }
-      flags { "LinkTimeOptimization", "Symbols", "FatalWarnings", "Unicode" }
+      flags { "LinkTimeOptimization", "FatalWarnings" }
       targetsuffix ("_Release" .. _AMD_VS_SUFFIX)
       optimize "On"