btstack_util: provide replacement for strncasecmp, strcasecmp in Visual Studio

btstack_util: add read/write single bytes to little_endian/big_endian functions

for symmetry reasons

btstack_util: add N_BITS macro

btstack_util: add safe versions of snprintf

btstack_util: use uint8 instead of unsigned char

btstack_util: calculate CRC32 value using ISO 3309 (HDLC), polynomial (normal) 0x04c11db7

btstack_util: return bool for uuid_has_bluetooth_prefix

btstack_util: use uint8_t as input for char_for_nibble

btstack_util: add btstack_is_null_bd_addr function
test/le_audio: switch to btstack_is_null_bd_addr

btstack_util: add btstack_is_null

btstack_util: extend btstack_strcpy to return bytes copied

btstack_util: implement btstack_virtual_memcpy that copies a chunk of data into a virtual buffer backed by a physical buffer.

btstack_util: add btstack_time16_delta for 16-bit timers

btstack_util: provide btstack_clz

btstack_util: add btstack_strcat

btstack_util: extract bd_addr_to_str_with_delimiter

btstack_util: add btstack_strcpy

license: update text

docs: use @return instead of @returns

btstack_util: add btstack_next_cid_ignoring_zero

MISRAC2012-Rule-8.3_b: match function declaration and definition

avoid function param modification

src: add title to header files

btstack_util: avoid signed/unsigned mix

btstack_util: provide btstack_replace_bd_addr_placeholder