fbt: fixes for ufbt compat (#1940)

* fbt: split sdk management code
* scripts: fixed import handling
* fbt: sdk: reformatted paths
* scrips: dist: bundling libs as a build artifact
* fbt: sdk: better path management
* typo fix
* fbt: sdk: minor path handling fixes
* toolchain: fixed windows toolchain download

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

site_scons/extapps.scons

@@ -21,7 +21,7 @@ appenv = ENV.Clone(
 )
 
 appenv.Replace(
-    LINKER_SCRIPT="application_ext",
+    LINKER_SCRIPT=appenv.subst("$APP_LINKER_SCRIPT"),
 )
 
 appenv.AppendUnique(

site_scons/firmwareopts.scons

@@ -32,12 +32,27 @@ else:
         ],
     )
 
-ENV.Append(
+ENV.AppendUnique(
     LINKFLAGS=[
-        "-Tfirmware/targets/f${TARGET_HW}/${LINKER_SCRIPT}.ld",
+        "-specs=nano.specs",
+        "-specs=nosys.specs",
+        "-Wl,--gc-sections",
+        "-Wl,--undefined=uxTopUsedPriority",
+        "-Wl,--wrap,_malloc_r",
+        "-Wl,--wrap,_free_r",
+        "-Wl,--wrap,_calloc_r",
+        "-Wl,--wrap,_realloc_r",
+        "-n",
+        "-Xlinker",
+        "-Map=${TARGET}.map",
+        "-T${LINKER_SCRIPT_PATH}",
     ],
 )
 
+ENV.SetDefault(
+    LINKER_SCRIPT_PATH="firmware/targets/f${TARGET_HW}/${LINKER_SCRIPT}.ld",
+)
+
 if ENV["FIRMWARE_BUILD_CFG"] == "updater":
     ENV.Append(
         IMAGE_BASE_ADDRESS="0x20000000",
@@ -47,4 +62,5 @@ else:
     ENV.Append(
         IMAGE_BASE_ADDRESS="0x8000000",
         LINKER_SCRIPT="stm32wb55xx_flash",
+        APP_LINKER_SCRIPT="application_ext",
     )