NFC: fix MFC timings (#2719)

* digital signal: add optimization
* nfc test: more restrict tests
* digital signal: build as separate library
* digital signal: remove unused flags, format sources
* digital signal: fix cflag name
* target: fix build for f18 target

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

firmware/targets/f7/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,28.1,,
+Version,+,28.2,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/cli/cli.h,,
 Header,+,applications/services/cli/cli_vcp.h,,
@@ -86,6 +86,7 @@ Header,+,firmware/targets/furi_hal_include/furi_hal_usb_hid.h,,
 Header,+,firmware/targets/furi_hal_include/furi_hal_usb_hid_u2f.h,,
 Header,+,firmware/targets/furi_hal_include/furi_hal_version.h,,
 Header,+,firmware/targets/furi_hal_include/furi_hal_vibro.h,,
+Header,+,lib/digital_signal/digital_signal.h,,
 Header,+,lib/flipper_application/api_hashtable/api_hashtable.h,,
 Header,+,lib/flipper_application/api_hashtable/compilesort.hpp,,
 Header,+,lib/flipper_application/flipper_application.h,,

firmware/targets/f7/target.json

@@ -28,6 +28,7 @@
         "flipperformat",
         "toolbox",
         "nfc",
+        "digital_signal",
         "pulse_reader",
         "microtar",
         "usb_stm32",