Refactor/deprecate some allocs

[jlnav]

Deprecation Module experiments

Experiments with deprecating old allocs, a new gen class for pregenerated work, and a deprecation module

[codecov]

Codecov Report

❌ Patch coverage is 53.84615% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.91%. Comparing base (a4d74df) to head (cf18309).
⚠️ Report is 21 commits behind head on develop.

Files with missing lines	Patch %	Lines
libensemble/gen_classes/preloaded.py	44.44%	20 Missing ⚠️
libensemble/alloc_funcs/start_fd_persistent.py	0.00%	2 Missing ⚠️
...ble/alloc_funcs/start_persistent_local_opt_gens.py	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (a4d74df) and HEAD (cf18309). Click for more details.

HEAD has 13 uploads less than BASE

Flag	BASE (a4d74df)	HEAD (cf18309)
	21	8

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1746       +/-   ##
============================================
- Coverage    88.95%   75.91%   -13.05%     
============================================
  Files           82       86        +4     
  Lines         8982     9145      +163     
  Branches      1393     1405       +12     
============================================
- Hits          7990     6942     -1048     
- Misses         750     1902     +1152     
- Partials       242      301       +59     

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