[FL-3162] Moved ufbt to fbt codebase (#2520)

* scripts: moved ufbt code
* ufbt: fixed tool path
* ufbt: fixed linter/formatter target descriptions
* scripts: ufbt: cleanup
* fbt: moved fap launch target to tools; ufbt fixes
* fbt: fixed missing headers from SDK
* ufbt: removed debug output
* ufbt: moved project template to main codebase
* ufbt: fixed vscode_dist
* ufbt: path naming changes
* fbt: error message for older ufbt versions
* ufbt: docs fixes
* ufbt: fixed build dir location
* fbt: fixes for extapps objcopy
* fbt: extapps: removed extra debug output; fixed formatting
* ufbt: handle launch target for multiple known apps
* ufbt: dropping wrapper; linter fixes
* ufbt: fixed boostrap path
* ufbt: renamed entrypoint
* ufbt: updated vscode config
* ufbt: moved sconsign db location
* ufbt: fixed sconsign path
* fbt: SDK builders rework
* fbt: reworked sdk packaging
* ufbt: additional checks and state processing
* ufbt: fixed sdk state file location
* dist: not packaging pycache
* dump commit json content
* Github: more workflow debug prints
* Github: fix incorrect commit meta extraction in get_env.py
* ufbt, fbt: changed SConsEnvironmentError->StopError
* fbtenv: no longer needs SCRIPT_PATH pre-set
* ufbt: fixed sdk state check
* scripts: exception fixes for storage.py
* scripts: fbtenv: added FBT_TOOLCHAIN_PATH for on Windows for compat
* ufbt: app template: creating .gitkeep for images folder
* ufbt: app template: fixed .gitkeep creation
* docs: formatting fixes for AppManifests; added link to ufbt
* fbt: added link to PyPI for old ufbt versions
* sdk: fixed dir component paths

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

scripts/ufbt/site_tools/ufbt_help.py

@@ -0,0 +1,53 @@
+targets_help = """Configuration variables:
+"""
+
+tail_help = """
+
+TASKS:
+    (* - not supported yet)
+
+    launch:
+        Upload and start application over USB
+    vscode_dist:
+        Configure application in current directory for development in VSCode.
+    create:
+        Copy application template to current directory. Set APPID=myapp to create an app with id 'myapp'.
+
+Building:
+    faps:
+        Build all FAP apps
+    fap_{APPID}, launch APPSRC={APPID}:
+        Build FAP app with appid={APPID}; upload & start it over USB
+
+Flashing & debugging:
+    flash, flash_blackmagic, *jflash:
+        Flash firmware to target using debug probe
+    flash_usb, flash_usb_full:
+        Install firmware using self-update package
+    debug, debug_other, blackmagic:
+        Start GDB
+
+Other:
+    cli:
+        Open a Flipper CLI session over USB
+    lint:
+        run linter for C code
+    format:
+        reformat C code
+
+How to create a new application:
+    1. Create a new directory for your application and cd into it.
+    2. Run `ufbt vscode_dist create APPID=myapp`
+    3. In VSCode, open the folder and start editing.
+    4. Run `ufbt launch` to build and upload your application.
+"""
+
+
+def generate(env, **kw):
+    vars = kw["vars"]
+    basic_help = vars.GenerateHelpText(env)
+    env.Help(targets_help + basic_help + tail_help)
+
+
+def exists(env):
+    return True