att_db: pass att operation mode read/write to att_validate_security

att: support for delayed att read response

att_db: detect persistent ccc by attribute uuid instead of explicit flag

att_db: pass att iterator into att_persistent_ccc_cache

att_db/att_server: log_info -> log_debug to have no debug output for le streamer

att_db: add att_is_persistent_ccc

att: moved service handling from att_db into att_server, att_register_service_handler -> att_server_register_service_handler

att_db: add att_read_callback helpers for 1,2,4 byte unsigned little endian and blob data

compile_gatt+att_db+att_db_util: make Client Characteristic Configuration readable without authentication but require permissions for write

att_db: validate prepared writes before execution. Additional att_write_callback with ATT_TRANSACTION_MODE_VALIDATE

tool: add update_filename.py that adds __BTSTACK_FILE__ to every .c file for use with debug output instead of __FILE__

LE: require ENABLE_LE_SIGNED_WRITE for ATT/GATT Signed Writes

fix unused parameters warning

gatt_server: add minimal functionality to support modular GATT Server Server implementations

att_server: allow to register handler for handle range - needed for modular service implmeentation

add classic/core.h and ble/core.h, add ENABLE_CLASSIC where missing

use hci_con_handle_t more

use hci_con_handle_t more

att -> att_db