stmhal: Enable REPL auto indent; document paste mode in help().

stmhal/help.c

@@ -67,6 +67,7 @@ STATIC const char *help_text =
 "  CTRL-B        -- on a blank line, enter normal REPL mode\n"
 "  CTRL-C        -- interrupt a running program\n"
 "  CTRL-D        -- on a blank line, do a soft reset of the board\n"
+"  CTRL-E        -- on a blank line, enter paste mode\n"
 "\n"
 "For further help on a specific object, type help(obj)\n"
 ;

stmhal/mpconfigport.h

@@ -40,6 +40,7 @@
 #define MICROPY_STACK_CHECK         (1)
 #define MICROPY_HELPER_REPL         (1)
 #define MICROPY_REPL_EMACS_KEYS     (1)
+#define MICROPY_REPL_AUTO_INDENT    (1)
 #define MICROPY_ENABLE_SOURCE_LINE  (1)
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_FLOAT)