Provide signatures for public functions that can take strings as opposed to BLEUUIDs

[nkolban]

There are public functions today that take BLEUUIDs ... provide alternatives/over-rides that accept strings.

For example, where we have a function that looks like:

void foo(BLEUUID uuid)

provide an additional signature that looks like:

void foo(char* uuid) {
   foo(BLEUUID(std::string(uuid)));
}

and

void foo(std::string uuid) {
   foo(BLEUUID(uuid));
}

[copercini]

Working on it =)

[nkolban]

@copercini provided an excellent implementation that has been pushed and merged. I think we can close this issue for the time being.