Rework analysis

Include new metrics: strength, sample efficiency, training_efficiency, stability, consistency
rewrite analysis, retro_analysis, viz modules with major simplification
use nested folder to organizing data
separate eval loop to analysis.gen_avg_return

Refactor and improvements

rename total_t to frame, standardize clock to always use frame as main tick, and remove extraneous settings
refactor control.py, search.py
remove evolutionary search deap to prepare for future ray.tune update
various small performance optimization
make unit tests more robust for testing specs; ensure it runs through analysis
update _random_baselines.json to be more comprehensive
rename training_epoch -> training_iter and training_batch_epoch -> training_batch_iter for accurate semantics.
propagate changes to specs