Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

third_party/python/Modules/_io/bytesio.c

@@ -206,8 +206,8 @@ write_bytes(bytesio *self, const char *bytes, Py_ssize_t len)
           |   |            <--to pad-->|<---to write--->    |
           0   buf                   position
         */
-        memset(PyBytes_AS_STRING(self->buf) + self->string_size, '\0',
-               (self->pos - self->string_size) * sizeof(char));
+        bzero(PyBytes_AS_STRING(self->buf) + self->string_size,
+              (self->pos - self->string_size) * sizeof(char));
     }
 
     /* Copy the data to the internal buffer, overwriting some of the existing

third_party/python/Modules/_io/stringio.c

@@ -257,8 +257,8 @@ write_str(stringio *self, PyObject *obj)
           0   buf                   position
 
         */
-        memset(self->buf + self->string_size, '\0',
-               (self->pos - self->string_size) * sizeof(Py_UCS4));
+        bzero(self->buf + self->string_size,
+              (self->pos - self->string_size) * sizeof(Py_UCS4));
     }
 
     /* Copy the data to the internal buffer, overwriting some of the

third_party/python/Modules/_io/winconsoleio.c

@@ -559,7 +559,6 @@ read_console_w(HANDLE handle, DWORD maxlen, DWORD *readlen) {
 
     *readlen = 0;
 
-    //DebugBreak();
     Py_BEGIN_ALLOW_THREADS
     DWORD off = 0;
     while (off < maxlen) {