py/repl: Generalise REPL autocomplete to use qstr probing.

This patch changes the way REPL autocomplete finds matches.  It now probes
the target object for all qstrs via mp_load_method_maybe to look for a
match with the given input string.  Similar to how the builtin dir()
function works, this new algorithm now find all methods and instances of
user-defined classes including attributes of their parent classes.  This
helps a lot at the REPL prompt for user-discovery and to autocomplete names
even for classes that are derived.

The downside is that this new algorithm is slower than the previous one,
and in particular will be slower the more qstrs there are in the system.
But because REPL autocomplete is primarily used in an interactive way it is
not that important to make it fast, as long as it is "fast enough" compared
to human reaction.

On a slow microcontroller (CPU running at 16MHz) the autocomplete time for
a list of 35 names in the outer namespace (pressing tab at a bare prompt)
takes about 160ms with this algorithm, compared to about 40ms for the
previous implementation (this time includes the actual printing of the
names as well).  This time of 160ms is very reasonable especially given the
new functionality of listing all the names.

This patch also decreases code size by:

   bare-arm:    +0
minimal x86:  -128
   unix x64:  -128
unix nanbox:  -224
      stm32:   -88
     cc3200:   -80
    esp8266:   -92
      esp32:   -84

1 files changed, 5 insertions, 5 deletions

diff --git a/tests/unix/extra_coverage.py.exp b/tests/unix/extra_coverage.py.exp
index 26fd2e332..8a2c6aea9 100644
--- a/tests/unix/extra_coverage.py.exp
+++ b/tests/unix/extra_coverage.py.exp
@@ -24,11 +24,11 @@ RuntimeError:
 # repl
 ame__
 
-__name__        path            argv            version
-version_info    implementation  platform        byteorder
-maxsize         exit            stdin           stdout
-stderr          modules         exc_info        getsizeof
-print_exception
+__class__       __name__        argv            byteorder
+exc_info        exit            getsizeof       implementation
+maxsize         modules         path            platform
+print_exception                 stderr          stdin
+stdout          version         version_info
 ementation
 # attrtuple
 (start=1, stop=2, step=3)