le_device_db_tlv: compare against NULL

Use boolean for conditionals

le_device_db: dump LTK as well

le_device_db_tlv: don't increase num valid entries if entry is replaced

license: update text

docs: use @return instead of @returns

add 'U' to unsigned constants

MISRAC2012-Rule-14.4_c: compare against 0 or NULL

fix warnings for log_info/printf

le_device_db_tlv: check entry index

MISRAC2012-Rule-10.4_a: append 'u' to constant literals when used in unsigned expressions or comparisons

MISRAC2012-Rule-8.9: inline const objects that are used by single function

ignore memcpy return value (always returns first parameter)

tlv: handle error for store_tag, document delete_tag expectations

MISRAC2012-Rule-12.1: add suggested parentheses

le_device_db_tlv: btstack_assert that tlv was configured

Use BTSTACK_FILE__ without __ prefix (MISRAC2012-Rule-21.1)

le_device_db: add secure connection field

le_device_db_tlv: return null addr and BD_ADDR_TYPE_UNKNOWN if device entry does not exist

le_device_db_tlv: return null addr and BD_ADDR_TYPE_UNKNOWN if device entry does not exist

le_device_db_tlv: return null addr and BD_ADDR_TYPE_UNKNOWN if device entry does not exist

cleanup: remove unused std libs

le_device_db_tlv: log_error if tlv isn't initialized, try not to crash

le_device_db_tlv: fix seq nr management

le_device_db_tlv: check if entry exists before decreasing count