Implement config manager and built-in channel controllers

[daboehme]

No description provided.

[codecov-io]

Codecov Report

Merging #174 into master will increase coverage by 0.11%.
The diff coverage is 80.99%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   75.22%   75.33%   +0.11%     
==========================================
  Files         108      112       +4     
  Lines        7754     7875     +121     
==========================================
+ Hits         5833     5933     +100     
- Misses       1921     1942      +21

Impacted Files	Coverage Δ
include/caliper/ChannelController.h	0% <ø> (ø)	⬆️
src/caliper/controllers/controllers.cpp	100% <100%> (ø)
src/caliper/ChannelController.cpp	77.08% <100%> (+5.34%)	⬆️
...rc/caliper/controllers/RuntimeReportController.cpp	76.92% <76.92%> (ø)
src/caliper/ConfigManager.cpp	78.65% <78.65%> (ø)
src/caliper/controllers/EventTraceController.cpp	93.75% <93.75%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d1cfc89...04cb6f8. Read the comment docs.