Replace autotools with meson

To introduce much simpler build configuration which is also easier to
maintain.

src/bash-completion/meson.build

@@ -0,0 +1,19 @@
+conf = configuration_data()
+conf.set('baudrates', baudrates)
+
+completion_file = configure_file( input: files('tio.in'),
+                                  output: 'tio',
+                                  configuration: conf,
+                                )
+
+bashcompletiondir = get_option('bashcompletiondir')
+if bashcompletiondir == ''
+  bash_completion_dep = dependency('bash-completion', required: false)
+  if bash_completion_dep.found()
+    bashcompletiondir = join_paths(get_option('datadir'), 'bash-completion', 'completions')
+  endif
+endif
+
+if (bashcompletiondir != 'no') and (bashcompletiondir != '')
+  install_data(completion_file, install_dir: bashcompletiondir)
+endif