macOS compatibility + cleaning

• Lazy.h has been modified so that it can be compiled with AppleClang.
• OSX.cmake has been updated for my mac. It has been renamed maclam.cmake (the name of my mac).
• References to disable-trilinos.cmake have been removed.
• Old .cmake files such as spring.cmake or codeblocks.cmake have been removed.
• new cmake files have been created: use-intel-compiler.cmake and use-clang-compiler.cmake.

CMake/OSX.cmake

@@ -14,5 +14,5 @@
 
 # Disable Trilinos (we should test with Trilinos/clang)
 LIST(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
-INCLUDE(disable-trilinos)
 
+SET(Python3_ROOT_DIR "/Library/Frameworks/Python.framework/Versions/3.7" CACHE PATH "" FORCE)