build: add hlsl files to visual studio (doodlum#92)

* refactor: remove redundant state load

* fix: set bLandSpecular to support Terrain Parallax

bLandSpecular may be disabled by certain mod lists and is necessary for
terrain parallax. This will force the setting to true when Terrain
Parallax is enabled.

* build: add hlsl files to visual studio

Adds Feature and Package files for editing in VS.

cmake/AddCXXFiles.cmake

@@ -41,4 +41,21 @@ function(add_cxx_files TARGET)
 		FILES ${SOURCE_FILES})
 
 	target_sources("${TARGET}" PRIVATE ${SOURCE_FILES})
+
+	file(GLOB_RECURSE HLSL_FILES
+		LIST_DIRECTORIES false
+		CONFIGURE_DEPENDS
+		"Features/**/*.hlsl"
+		"Features/**/*.hlsli"
+		"Package/**/*.hlsl"
+		"Package/**/*.hlsli"
+	)
+
+	source_group(TREE ${CMAKE_CURRENT_SOURCE_DIR}/
+		PREFIX "HLSL Files"
+		FILES ${HLSL_FILES})
+
+	set_source_files_properties(${HLSL_FILES} PROPERTIES VS_TOOL_OVERRIDE "None")
+
+	target_sources("${TARGET}" PRIVATE ${HLSL_FILES})
 endfunction()