Updated cmake to better organize folders and options.

This adds solution folders that properly group gtest/glslang/hlsl.
This also marks gtest options as advanced so they don't show up
in cmake-gui by default.

glslang/CMakeLists.txt

@@ -75,6 +75,7 @@ set(HEADERS
 # set(BISON_GLSLParser_OUTPUT_SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/MachineIndependent/glslang_tab.cpp)
 
 add_library(glslang STATIC ${BISON_GLSLParser_OUTPUT_SOURCE} ${SOURCES} ${HEADERS})
+set_property(TARGET glslang PROPERTY FOLDER glslang)
 
 if(WIN32)
     source_group("Public" REGULAR_EXPRESSION "Public/*")

glslang/OSDependent/Unix/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(OSDependent STATIC ossource.cpp ../osinclude.h)
+set_property(TARGET OSDependent PROPERTY FOLDER glslang)
 
 install(TARGETS OSDependent 
         ARCHIVE DESTINATION lib)

glslang/OSDependent/Windows/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(SOURCES ossource.cpp ../osinclude.h)
 
 add_library(OSDependent STATIC ${SOURCES})
+set_property(TARGET OSDependent PROPERTY FOLDER glslang)
 
 # MinGW GCC complains about function pointer casts to void*.
 # Turn that off with -fpermissive.