Changed build files to meson

meson.build

@@ -0,0 +1,54 @@
+project(
+  'FluxEngine',
+  'cpp',
+  version : '0.1.0',
+  meson_version : '>=0.60.0',
+  default_options : [
+    'cpp_std=c++20',
+    'warning_level=3',
+    'buildtype=debugoptimized',
+  ]
+)
+
+# 1) Grab the active C++ compiler
+cpp = meson.get_compiler('cpp')
+ccid = cpp.get_id()  # e.g. 'msvc', 'gcc', 'clang', 'intel', ...
+
+# 2) Decide your D-flag prefix
+if ccid == 'msvc'
+  dflag = '/D'
+else
+  dflag = '-D'
+endif
+
+# 3) Platform macro (all OSes)
+sys = host_machine.system()
+if sys == 'windows'
+  plat = 'FLUX_PLATFORM_WINDOWS'
+elif sys == 'linux'
+  plat = 'FLUX_PLATFORM_LINUX'
+elif sys == 'darwin'
+  plat = 'FLUX_PLATFORM_MACOS'
+elif sys == 'freebsd'
+  plat = 'FLUX_PLATFORM_FREEBSD'
+else
+  plat = 'FLUX_PLATFORM_UNKNOWN'
+endif
+
+add_global_arguments(dflag + plat, language : 'cpp')
+
+# 4) Build-type macros
+bt = get_option('buildtype')
+if bt == 'debug'
+  add_project_arguments(dflag + 'FLUX_DEBUG', language : 'cpp')
+elif bt == 'release'
+  add_project_arguments(dflag + 'FLUX_RELEASE', language : 'cpp')
+elif bt == 'debugoptimized'
+  add_project_arguments(dflag + 'FLUX_DIST', language : 'cpp')
+else
+  warning('Unrecognized buildtype: ' + bt)
+endif
+
+# Tell Meson to descend into these directories
+subdir('FluxEngine')
+subdir('Sandbox')