Split out pretty-print.c and move pager.c and main-func.h to shared/

This is high-level functionality, and fits better in shared/ (which is for
our executables), than in basic/ (which is also for libraries).

src/tmpfiles/tmpfiles.c

@@ -46,6 +46,7 @@
 #include "parse-util.h"
 #include "path-lookup.h"
 #include "path-util.h"
+#include "pretty-print.h"
 #include "rm-rf.h"
 #include "selinux-util.h"
 #include "set.h"
@@ -55,7 +56,6 @@
 #include "string-table.h"
 #include "string-util.h"
 #include "strv.h"
-#include "terminal-util.h"
 #include "umask-util.h"
 #include "user-util.h"
 #include "util.h"