Import latest CJSON and libcbor. (#1223)

Add API for a more compact (no dashes) UUID-to-str (#1212)

Co-authored-by: Bret Ambrose <[email protected]>

Fix invalid XML Buffer Overflow Error (#1201)

Simplify how inline math files are included (#1195)

**Issue #:**

* #1155
* #1194

Users are reporting double definition of the math inline functions, when building in scenarios I'm not familiar with...

The [existing ifdef logic](https://github.com/awslabs/aws-c-common/blob/c6f8f8a3b267e2a2229f71ed0d4b087edd780845/include/aws/common/math.inl#L16-L47) is very hard to follow, so it's not surprising there are edge cases.

**Description of changes:**

Simplify how inline math files are included

- Just have 1 big `#ifdef/elif/elif` chain
  - If a branch needs 2 .inl files, then include both from from that branch
  - math.fallback.inl no longer includes math.gcc_builtin.inl in some circumstances. It's the fallback file. Let's keep it simple.
- Stop doing the thing where we don't include the .inl files when building `__cplusplus`.
  - This added too much complexity. Whatever [weird performance edge case](https://github.com/awslabs/aws-c-common/blob/c6f8f8a3b267e2a2229f71ed0d4b087edd780845/include/aws/common/math.inl#L38-L40) we were working around in 2018 is surely fixed in modern compilers.

CrossProcess lock -- don't unlock, just close fd (#1192)

Use sleep-aware monotonic clock if available (#1189)

Co-authored-by: Bret Ambrose <[email protected]>

Support prebuild on win/mac (#1191)

Co-authored-by: Michael Graeb <[email protected]>

New Get_ENV Functions (#1141)

Make aws_byte_cursor_from_string NULL tolerant (#1187)

A bunch of CMake fixes (#1178)