Do minor changes to cmake files

This is a partial port of the commit
3568f43cd5b1e246aec3f1347fc353f388885f1a from the ogre (not ogre-next)
repository, omitting the zip header changes which doesn't apply.

  * MacroLogFeature: Clarify that even if a package is found it will not be used if a feature is disabled
  * Use list append on CMAKE_MODULE_PATH to allow prepending it with toolchain file, which is used with conan recipe.

CMakeLists.txt

@@ -58,7 +58,7 @@ endif()
 project(OGRE-Next)
 
 # Include necessary submodules
-set(CMAKE_MODULE_PATH
+list(APPEND CMAKE_MODULE_PATH
   "${PROJECT_SOURCE_DIR}/CMake"
   "${PROJECT_SOURCE_DIR}/CMake/Utils"
   "${PROJECT_SOURCE_DIR}/CMake/Packages"