[FL-3965] Separate cli_shell into toolbox (#4175)

* cli_shell: separate into toolbox

* fix: cmd flags

* fix formatting

* cli: increase default stack depth

* cli_shell: fix loader lock logic

* cli: fix command flags

* fix f18

* speaker_debug: fix

* cli_registry: fix docs

* ufbt: rename cli target back

* cli: rename app and record

* cli: fix and simplify help command

* cli_master_shell: fix ext commands

* fix formatting

* cli: rename master to main

* fix formatting

---------

Co-authored-by: hedger <hedger@users.noreply.github.com>

applications/services/cli/application.fam

@@ -4,17 +4,9 @@ App(
     entry_point="cli_on_system_start",
     cdefines=["SRV_CLI"],
     sources=[
-        "cli.c",
-        "shell/cli_shell.c",
-        "shell/cli_shell_completions.c",
-        "shell/cli_shell_line.c",
-        "cli_commands.c",
         "cli_command_gpio.c",
-        "cli_ansi.c",
-    ],
-    sdk_headers=[
-        "cli.h",
-        "cli_ansi.h",
+        "cli_main_commands.c",
+        "cli_main_shell.c",
     ],
     # This STARTUP has to be processed before those that depend on the "cli" record.
     # "cli" used to be a SERVICE, but it's been converted into a STARTUP in order to
@@ -49,3 +41,11 @@ App(
     requires=["cli"],
     sources=["commands/neofetch.c"],
 )
+
+App(
+    appid="cli_subshell_demo",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="cli_subshell_demo_ep",
+    requires=["cli"],
+    sources=["commands/subshell_demo.c"],
+)