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>

firmware.scons

@@ -9,7 +9,11 @@ from fbt.util import (
 
 # Building initial C environment for libs
 env = ENV.Clone(
-    tools=["compilation_db", "fwbin", "fbt_apps"],
+    tools=[
+        ("compilation_db", {"COMPILATIONDB_COMSTR": "\tCDB\t${TARGET}"}),
+        "fwbin",
+        "fbt_apps",
+    ],
     COMPILATIONDB_USE_ABSPATH=False,
     BUILD_DIR=fw_build_meta["build_dir"],
     IS_BASE_FIRMWARE=fw_build_meta["type"] == "firmware",
@@ -76,7 +80,6 @@ if not env["VERBOSE"]:
         HEXCOMSTR="\tHEX\t${TARGET}",
         BINCOMSTR="\tBIN\t${TARGET}",
         DFUCOMSTR="\tDFU\t${TARGET}",
-        OPENOCDCOMSTR="\tFLASH\t${SOURCE}",
     )
 
 
@@ -139,7 +142,7 @@ apps_c = fwenv.ApplicationsC(
     Value(fwenv["APPS"]),
 )
 # Adding dependency on manifest files so apps.c is rebuilt when any manifest is changed
-fwenv.Depends(apps_c, fwenv.GlobRecursive("*.fam", "applications"))
+fwenv.Depends(apps_c, fwenv.GlobRecursive("*.fam", "#/applications"))
 
 sources = [apps_c]
 # Gather sources only from app folders in current configuration
@@ -164,6 +167,8 @@ fwenv.AppendUnique(
         "-u",
         "_printf_float",
         "-n",
+        "-Xlinker",
+        "-Map=${TARGET}.map",
     ],
 )
 
@@ -202,7 +207,6 @@ fwelf = fwenv["FW_ELF"] = fwenv.Program(
     ],
 )
 
-# Make it depend on everything child builders returned
 # Firmware depends on everything child builders returned
 Depends(fwelf, lib_targets)
 # Output extra details after building firmware
@@ -232,7 +236,8 @@ if should_gen_cdb_and_link_dir(fwenv, BUILD_TARGETS):
     fwcdb = fwenv.CompilationDatabase()
     # without filtering, both updater & firmware commands would be generated
     fwenv.Replace(COMPILATIONDB_PATH_FILTER=fwenv.subst("*${FW_FLAVOR}*"))
-    Depends(fwcdb, fwelf)
+    AlwaysBuild(fwcdb)
+    Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_cdb", fwcdb)
     fw_artifacts.append(fwcdb)
 
     # Adding as a phony target, so folder link is updated even if elf didn't change