Bump c++ standard version to 14

CMakeLists.txt

@@ -361,9 +361,9 @@ if (NOT WIN32 AND NOT APPLE)
 endif()
 
 # CXX Compiler settings
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 if (CMAKE_CXX_COMPILER_ID STREQUAL GNU OR CMAKE_CXX_COMPILER_ID STREQUAL Clang)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wundef -Wno-unused-parameter -std=c++11 -pedantic -Wno-long-long")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wundef -Wno-unused-parameter -pedantic -Wno-long-long")
     add_definitions( -DBOOST_NO_CXX11_SCOPED_ENUMS=ON )
 
     if (APPLE)
@@ -893,4 +893,3 @@ if (DOXYGEN_FOUND)
         WORKING_DIRECTORY ${OpenMW_BINARY_DIR}
         COMMENT "Generating documentation for the github-pages at ${DOXYGEN_PAGES_OUTPUT_DIR}" VERBATIM)
 endif ()
-