meson use default warnings

meson.build

@@ -1,22 +1,14 @@
-project('2048', 'cpp', 
-  default_options : ['cpp_std=c++14'])
-
-
-cxx = meson.get_compiler('cpp')
-if cxx.get_id() in ['gcc', 'clang']
-  add_global_arguments('-Wall', language : 'cpp')
-elif cxx.get_id() == 'intel'
-  add_global_arguments('-w2', language : 'cpp')
-endif
+project('2048', 'cpp',
+  default_options : ['cpp_std=c++14', 'warning_level=2'])
 
 main_target_name = '2048'
 sources = ['src/2048.cpp', 'src/gameboard.cpp', 'src/gameboard-graphics.cpp', 'src/game.cpp', 'src/game-input.cpp', 'src/game-graphics.cpp', 'src/game-pregamemenu.cpp', 'src/global.cpp', 'src/loadresource.cpp', 'src/menu.cpp', 'src/menu-graphics.cpp', 'src/saveresource.cpp', 'src/scores.cpp', 'src/scores-graphics.cpp', 'src/statistics.cpp', 'src/statistics-graphics.cpp', 'src/tile.cpp', 'src/tile-graphics.cpp']
 hdrs = include_directories('src/headers')
 
-executable(main_target_name, sources, 
+executable(main_target_name, sources,
   include_directories : hdrs,
   install : true)
-  
+
 install_data(['data/scores.txt', 'data/statistics.txt'],
   install_dir : 'data')