Rename "Micro Python" to "MicroPython" in REPL, help, readme's and misc.

tools/gen-changelog.sh

 #!/bin/sh
 
-echo "Micro Python change log"
+echo "MicroPython change log"
 
 for t in $(git tag | grep -v v1.0-rc1 | sort -rV); do
     echo ''

unix/main.c

@@ -153,7 +153,7 @@ STATIC char *strjoin(const char *s1, int sep_char, const char *s2) {
 #endif
 
 STATIC int do_repl(void) {
-    mp_hal_stdout_tx_str("Micro Python " MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE "; " MICROPY_PY_SYS_PLATFORM " version\n");
+    mp_hal_stdout_tx_str("MicroPython " MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE "; " MICROPY_PY_SYS_PLATFORM " version\n");
 
     #if MICROPY_USE_READLINE == 1