fbt fixes & improvements (#1490)

* fbt: minimal USB flash mode; scripts: faster storage.py with larger chunks
* fbt: fixed creation of temporary file nodes confusing scons
* docs: removed refs to --with-updater
* fbt: removed splashscreen from minimal update package
* fbt: renamed dist arguments for consistency
* docs: fixed updater_debug target
* fbt: separate target for generating compilation_database.json without building the code.
* fbt: added `jflash` target for programming over JLink probe; refactored usb flashing targets
* fbt: building updater_app in unit_tests configuration
* fbt: fixed reset behavior after flashing with J-Link
* fbt: generating .map file for firmware binary & external apps
* fbt/core: moved library contents before apps code

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

SConstruct

@@ -33,8 +33,10 @@ coreenv["ROOT_DIR"] = Dir(".")
 
 # Create a separate "dist" environment and add construction envs to it
 distenv = coreenv.Clone(
-    tools=["fbt_dist", "openocd", "blackmagic"],
-    OPENOCD_GDB_PIPE=["|openocd -c 'gdb_port pipe; log_output debug/openocd.log' ${[SINGLEQUOTEFUNC(OPENOCD_OPTS)]}"],
+    tools=["fbt_dist", "openocd", "blackmagic", "jflash"],
+    OPENOCD_GDB_PIPE=[
+        "|openocd -c 'gdb_port pipe; log_output debug/openocd.log' ${[SINGLEQUOTEFUNC(OPENOCD_OPTS)]}"
+    ],
     GDBOPTS_BASE=[
         "-ex",
         "target extended-remote ${GDBREMOTE}",
@@ -61,6 +63,7 @@ distenv = coreenv.Clone(
         "-ex",
         "compare-sections",
     ],
+    JFLASHPROJECT="${ROOT_DIR.abspath}/debug/fw.jflash",
     ENV=os.environ,
 )
 
@@ -71,7 +74,9 @@ firmware_env = distenv.AddFwProject(
 )
 
 # If enabled, initialize updater-related targets
-if GetOption("fullenv"):
+if GetOption("fullenv") or any(
+    filter(lambda target: "updater" in target or "flash_usb" in target, BUILD_TARGETS)
+):
     updater_env = distenv.AddFwProject(
         base_env=coreenv,
         fw_type="updater",
@@ -79,11 +84,11 @@ if GetOption("fullenv"):
     )
 
     # Target for self-update package
-    dist_arguments = [
-        "-r",
-        '"${ROOT_DIR.abspath}/assets/resources"',
+    dist_basic_arguments = [
         "--bundlever",
         '"${UPDATE_VERSION_STRING}"',
+    ]
+    dist_radio_arguments = [
         "--radio",
         '"${ROOT_DIR.abspath}/${COPRO_STACK_BIN_DIR}/${COPRO_STACK_BIN}"',
         "--radiotype",
@@ -92,16 +97,34 @@ if GetOption("fullenv"):
         "--obdata",
         '"${ROOT_DIR.abspath}/${COPRO_OB_DATA}"',
     ]
-    if distenv["UPDATE_SPLASH"]:
-        dist_arguments += [
+    dist_resource_arguments = [
+        "-r",
+        '"${ROOT_DIR.abspath}/assets/resources"',
+    ]
+    dist_splash_arguments = (
+        [
             "--splash",
             distenv.subst("assets/slideshow/$UPDATE_SPLASH"),
         ]
+        if distenv["UPDATE_SPLASH"]
+        else []
+    )
 
     selfupdate_dist = distenv.DistCommand(
         "updater_package",
         (distenv["DIST_DEPENDS"], firmware_env["FW_RESOURCES"]),
-        DIST_EXTRA=dist_arguments,
+        DIST_EXTRA=[
+            *dist_basic_arguments,
+            *dist_radio_arguments,
+            *dist_resource_arguments,
+            *dist_splash_arguments,
+        ],
+    )
+
+    selfupdate_min_dist = distenv.DistCommand(
+        "updater_minpackage",
+        distenv["DIST_DEPENDS"],
+        DIST_EXTRA=dist_basic_arguments,
     )
 
     # Updater debug
@@ -121,18 +144,16 @@ if GetOption("fullenv"):
     )
 
     # Installation over USB & CLI
-    usb_update_package = distenv.UsbInstall(
-        "#build/usbinstall.flag",
-        (
-            distenv["DIST_DEPENDS"],
-            firmware_env["FW_RESOURCES"],
-            selfupdate_dist,
-        ),
+    usb_update_package = distenv.AddUsbFlashTarget(
+        "#build/usbinstall.flag", (firmware_env["FW_RESOURCES"], selfupdate_dist)
     )
-    if distenv["FORCE"]:
-        distenv.AlwaysBuild(usb_update_package)
-    distenv.Depends(usb_update_package, selfupdate_dist)
-    distenv.Alias("flash_usb", usb_update_package)
+    distenv.Alias("flash_usb_full", usb_update_package)
+
+    usb_minupdate_package = distenv.AddUsbFlashTarget(
+        "#build/minusbinstall.flag", (selfupdate_min_dist,)
+    )
+    distenv.Alias("flash_usb", usb_minupdate_package)
+
 
 # Target for copying & renaming binaries to dist folder
 basic_dist = distenv.DistCommand("fw_dist", distenv["DIST_DEPENDS"])
@@ -147,8 +168,9 @@ distenv.Alias("copro_dist", copro_dist)
 
 firmware_flash = distenv.AddOpenOCDFlashTarget(firmware_env)
 distenv.Alias("flash", firmware_flash)
-if distenv["FORCE"]:
-    distenv.AlwaysBuild(firmware_flash)
+
+firmware_jflash = distenv.AddJFlashTarget(firmware_env)
+distenv.Alias("jflash", firmware_jflash)
 
 firmware_bm_flash = distenv.PhonyTarget(
     "flash_blackmagic",