[FL-3174] Dolphin builder in ufbt; minor ufbt/fbt improvements (#2601)

* ufbt: added "dolphin_ext" target (expects "external" subfolder in cwd with dolphin assets); cleaned up unused code
* ufbt: codestyle fixes
* scripts: fixed style according to ruff linter
* scripts: additional cleanup & codestyle fixes
* github: pass target hw code when installing local SDK with ufbt
* ufbt: added error message for missing folder in dolphin builder
* scripts: more linter fixes
* sdk: added flipper_format_stream; ufbt: support for --extra-define
* fbt: reduced amount of global defines
* scripts, fbt: rearranged imports

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

scripts/ufbt/commandline.scons

@@ -1,32 +1,18 @@
+AddOption(
+    "--extra-define",
+    action="append",
+    dest="extra_defines",
+    default=[],
+    help="Extra global define that will be passed to C/C++ compiler, can be specified multiple times",
+)
+
 AddOption(
     "--proxy-env",
     action="store",
     dest="proxy_env",
     default="",
-    help="Comma-separated list of additional environment variables to pass to child SCons processes",
-)
-
-AddOption(
-    "--channel",
-    action="store",
-    dest="sdk_channel",
-    choices=["dev", "rc", "release"],
-    default="",
-    help="Release channel to use for SDK",
-)
-
-AddOption(
-    "--branch",
-    action="store",
-    dest="sdk_branch",
-    help="Custom main repo branch to use for SDK",
-)
-
-AddOption(
-    "--hw-target",
-    action="store",
-    dest="sdk_target",
-    help="SDK Hardware target",
+    help="Comma-separated list of additional environment variables to pass to "
+    "child SCons processes",
 )
 
 vars = Variables("ufbt_options.py", ARGUMENTS)