Replace autotools with meson

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

man/Makefile.am

@@ -1 +0,0 @@
-dist_man_MANS = tio.1

man/meson.build

@@ -0,0 +1,17 @@
+mandir = join_paths(get_option('prefix'), get_option('mandir'))
+man1dir = join_paths(mandir, 'man1')
+
+conf = configuration_data()
+conf.set('version', meson.project_version())
+conf.set('version_date', version_date)
+
+manpage = configure_file(
+     input: files('tio.1.in'),
+     output: 'tio.1',
+     configuration: conf,
+)
+
+install_man(
+     manpage,
+     install_dir: man1dir,
+)

man/tio.1.in

@@ -1,4 +1,4 @@
-.TH "tio" "1" "June 2018"
+.TH "tio" "1" "@version_date@" "tio @version@" "User Commands"
 
 .SH "NAME"
 tio \- a simple TTY terminal I/O application