fbt: initial blackmagic support (#1362)

* fbt: added separate script for Windows env setup; moved flash targets from firmware.scons to SConstruct; added Blackmagic support with automatic probe port resolution; added apps.c rebuild on any manifest.fam changes; fixed simultaneous flash & debug ops
* fbt: added networked BlackmagicResolver mode; added `get_blackmagic` target for IDE integration
* fbt: cleanup
* fbt: docs update; fixed blackmagic lookup on certain usb hubs
* fbt: removed explicit python serial port import
* fbt: cleanup
* fbt: raising exception on multiple serial blackmagic probes

site_scons/fbt/util.py

@@ -42,3 +42,7 @@ def random_alnum(length):
     return "".join(
         random.choice(string.ascii_letters + string.digits) for _ in range(length)
     )
+
+
+def single_quote(arg_list):
+    return " ".join(f"'{arg}'" if " " in arg else str(arg) for arg in arg_list)