[FL-2859,2838] fbt: improvements for FAPs (#1813)

* fbt: assets builder for apps WIP
* fbt: automatically building private fap assets
* docs: details on how to use image assets
* fbt: renamed fap_assets -> fap_icons
* fbt: support for fap_extbuild field
* docs: info on fap_extbuild
* fbt: added --proxy-env parame ter
* fbt: made firmware_cdb & updater_cdb targets always available
* fbt: renamed fap_icons -> fap_icon_assets
* fbt: deprecated firmware_* target names for faps; new alias is "fap_APPID"
* fbt: changed intermediate file locations for external apps
* fbt: support for fap_private_libs; docs: updates
* restored mbedtls as global lib
* scripts: lint.py: skip "lib" subfolder
* fbt: Sanity checks for building advanced faps as part of fw
* docs: info on fap_private_libs; fbt: optimized *.fam indexing
* fbt: cleanup; samples: added sample_icons app
* fbt: moved example app to applications/examples
* linter fix
* docs: readme fixes
* added applications/examples/application.fam stub
* docs: more info on private libs

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

applications/plugins/picopass/application.fam

@@ -10,8 +10,11 @@ App(
     stack_size=4 * 1024,
     order=30,
     fap_icon="../../../assets/icons/Archive/125_10px.png",
-    fap_libs=[
-        "mbedtls",
-    ],
     fap_category="Tools",
+    fap_libs=["mbedtls"],
+    fap_private_libs=[
+        Lib(
+            name="loclass",
+        ),
+    ],
 )

applications/plugins/picopass/picopass_device.h

@@ -7,8 +7,8 @@
 #include <mbedtls/des.h>
 
 #include "rfal_picopass.h"
-#include "loclass/optimized_ikeys.h"
-#include "loclass/optimized_cipher.h"
+#include <optimized_ikeys.h>
+#include <optimized_cipher.h>
 
 #define PICOPASS_DEV_NAME_MAX_LEN 22
 #define PICOPASS_READER_DATA_MAX_SIZE 64