-cleaned Meson build files and added some comments

meson.build

@@ -52,10 +52,13 @@ endif
 add_global_arguments(args, language : 'd')
 add_global_link_arguments(link_args, language : 'd')
 
+versions = []
+
 if host_machine.cpu_family() == 'wasm32'
 	add_global_arguments('--output-bc', language : 'd') # Adding it in cross files breaks linker detection
 	emcc = find_program('emcc')
 	args_wasm = ['-O3', '-s', 'FORCE_FILESYSTEM=1', '-s', 'USE_SDL=2', '-s', 'USE_SDL_IMAGE=2', '-s', 'SDL2_IMAGE_FORMATS=["png"]', '-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM_MEM_MAX=1024MB', '-s', 'MALLOC=dlmalloc', '-s', 'WASM=1', '--shell-file', '../demos/emscripten_multi_shell.html', '-s', 'DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=1']
+	versions = ['ECSEmscripten']
 endif
 
 
@@ -64,6 +67,7 @@ threads_dep = dependency('threads')
 
 ecs_lib = library('decs', src,
 	include_directories : [inc],
+	d_module_versions : versions
 )
 
 decs_dep = declare_dependency(