Logging refactor

Task logging update (#76)

* channel task type tags
* Format string fix

Task tags and logging

Adds string tags to tasks and task logging for easier identification

Fixed 32-bit compile bug.

v0.3.11

stupid format specifiers. (#79)

Fixed timeout bug with keep alive PINGs

Addressed timeout timing bug with mqtt ping timeouts. (#78)

* Addressed timeout timing bug with mqtt ping timeouts.

More logging of timestamps and io operations.

More logging ref counts (#77)

More logging.

Miscellaneous cleanup

clang-tidy fixes
calloc for structure allocations

Added backtraces to asserts

assert() -> AWS_ASSERT(), removed assert includes (#69)

* assert() -> AWS_ASSERT(), removed assert includes

* added assert.h to clang-tidy restrictions

Added logging

Add logging to MQTT (#68)

* Setup logging subjects
* Add logging to topic tree
* Add logging to client.c
* Add logging to client_channel_handler.c
* iot test: Load io subjects, log publish packet id

Initial Connection failure propogation

v0.3.5

Initial connection failure propogates properly again. (#66)

Updates for aws-c-io api changes. Also memory leak fixes in reconnect.

v0.3.4

Updates for new host resolver interface from aws-c-io. (#65)