Improve Python and Linenoise

This change reinvents all the GNU Readline features I discovered that I
couldn't live without, e.g. UTF-8, CTRL-R search and CTRL-Y yanking. It
now feels just as good in terms of user interface from the subconscious
workflow perspective. It's real nice to finally have an embeddable line
reader that's actually good with a 30 kb footprint and a bsd-2 license.

This change adds a directory to the examples folder, explaining how the
new Python compiler may be used.  Some of the bugs with Python binaries
have been addressed but overall it's still a work in progress.

third_party/python/Lib/_bootlocale.py

@@ -1,21 +1,2 @@
-"""A minimal subset of the locale module used at interpreter startup
-(imported by the _io module), in order to reduce startup time.
-
-Don't import directly from third-party code; use the `locale` module instead!
-"""
-
-import sys
-import _locale
-
 def getpreferredencoding(do_setlocale=True):
-    assert not do_setlocale
-    result = _locale.nl_langinfo(_locale.CODESET)
-    if not result and sys.platform in ('darwin', 'cosmo'):
-        # nl_langinfo can return an empty string
-        # when the setting has an invalid value.
-        # Default to UTF-8 in that case because
-        # UTF-8 is the default charset on OSX and
-        # returning nothing will crash the
-        # interpreter.
-        result = 'UTF-8'
-    return result
+    return 'UTF-8'

third_party/python/Lib/re.py

@@ -123,10 +123,7 @@ import enum
 import sre_compile
 import sre_parse
 import functools
-try:
-    import _locale
-except ImportError:
-    _locale = None
+import _locale
 
 # public symbols
 __all__ = [