Deprecate OMNITRACE_USE_PERFETTO, OMNITRACE_USE_TIMEMORY (#306)

* Rename OMNITRACE_USE_PERFETTO to OMNITRACE_TRACE

* Rename OMNITRACE_USE_TIMEMORY to OMNITRACE_PROFILE

* Revert change to Perfetto.cmake

* Fix formatting

clang-format-11 was complaining about formatting

source/docs/python.md

@@ -115,7 +115,7 @@ if __name__ == "__main__":
     run(20)
 ```
 
-Using `omnitrace-python ./example.py` with `OMNITRACE_USE_TIMEMORY=ON` and `OMNITRACE_TIMEMORY_COMPONENTS=trip_count` would produce:
+Using `omnitrace-python ./example.py` with `OMNITRACE_PROFILE=ON` and `OMNITRACE_TIMEMORY_COMPONENTS=trip_count` would produce:
 
 ```console
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