feat(assets): moved all static assets to assets in prep for resource manager

assets/const/meson.build

@@ -0,0 +1,17 @@
+data_file = files('const.dat')
+command_file = files('format.sh')
+output_file = meson.current_build_dir() + '/embedded_constants.h'
+
+embedded_constants_h = custom_target('embed_constants',
+    input: data_file,
+    output: 'embedded_constants.h',
+    command: ['sh', '-c', command_file[0].full_path()+' @INPUT@ ' + output_file, '@INPUT@', '@OUTPUT@']
+)
+
+# Ensure the generated header is included
+const_data_header = include_directories('.')
+
+const_data_dep = declare_dependency(
+    include_directories: const_data_header,
+    sources: embedded_constants_h
+)