[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/project_template/app_template/${FBT_APPID}.c

@@ -0,0 +1,12 @@
+#include <furi.h>
+
+/* generated by fbt from .png files in images folder */
+#include <@FBT_APPID@_icons.h>
+
+int32_t @FBT_APPID@_app(void* p) {
+    UNUSED(p);
+    FURI_LOG_I("TEST", "Hello world");
+    FURI_LOG_I("TEST", "I'm @FBT_APPID@!");
+
+    return 0;
+}

scripts/ufbt/project_template/app_template/application.fam

@@ -0,0 +1,17 @@
+# For details & more options, see documentation/AppManifests.md in firmware repo
+
+App(
+    appid="@FBT_APPID@",  # Must be unique
+    name="App @FBT_APPID@",  # Displayed in menus
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="@FBT_APPID@_app",
+    stack_size=2 * 1024,
+    fap_category="Misc",
+    # Optional values
+    # fap_version=(0, 1),  # (major, minor)
+    fap_icon="@FBT_APPID@.png",  # 10x10 1-bit PNG
+    # fap_description="A simple app",
+    # fap_author="J. Doe",
+    # fap_weburl="https://github.com/user/@FBT_APPID@",
+    fap_icon_assets="images",  # Image assets to compile for this application
+)