Feature: Added ability to pass directives in docstrings

[Magnus167]

Currently functional directives-

::docs::function_name::sort_first::
::docs::function_name::sort_last::

As of now, all directives within a module are parsed together. i.e. it wouldn't matter if you were addressing some other function in a functions docstring.
For this reason, it is recommended to list these directives in the module docstring.
Future directives can include highlighting, more sorting, and even appending examples

[codecov]

Codecov Report

Merging #956 (ee08018) into develop (5bcd561) will not change coverage.
Report is 1 commits behind head on develop.
The diff coverage is 75.00%.

❗ Current head ee08018 differs from pull request most recent head e68eb3e. Consider uploading reports for the commit e68eb3e to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #956   +/-   ##
========================================
  Coverage    66.59%   66.59%           
========================================
  Files           38       38           
  Lines         4425     4425           
========================================
  Hits          2947     2947           
  Misses        1478     1478           

Files Changed	Coverage Δ
macrosynergy/download/jpmaqs.py	84.46% <ø> (ø)
macrosynergy/management/check_availability.py	37.80% <ø> (ø)
...rosynergy/management/simulate_quantamental_data.py	87.24% <ø> (ø)
macrosynergy/management/update_df.py	69.35% <ø> (ø)
macrosynergy/panel/basket.py	77.14% <ø> (ø)
macrosynergy/panel/converge_row.py	100.00% <ø> (ø)
macrosynergy/panel/historic_vol.py	79.81% <ø> (ø)
macrosynergy/panel/make_blacklist.py	65.57% <ø> (ø)
macrosynergy/panel/make_relative_value.py	81.55% <ø> (ø)
macrosynergy/panel/make_zn_scores.py	78.89% <ø> (ø)
... and 4 more

[Magnus167]

eg. alternatively, this could have been changed by adding:

::docs::get_unavailable_expressions::sort_last