MetaData Improvements

[gordonwatts]

• Add metadata documentation to readme.md
• Add the include_files metadata type: allows one to add include files as needed
• Internal clean-up
  • Reorg how ctyp.terminal is used, making everything cleanly inherit from a common base class
  • Make the collections in ATLAS and CMS inherit rather than duck typing them
  • Remove some code differences between ATLAS/CMS now that terminal is more capable
  • Track pointer-to-pointer, not just pointer (and pointer-to-pointer-to-pointer, etc.)
• Metadata improvements around handling pointers inside collections

[codecov[bot]]

Codecov Report

Merging #186 (0cdfbad) into master (524a69e) will increase coverage by 0.54%. The diff coverage is 97.35%.

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
+ Coverage   94.63%   95.18%   +0.54%     
==========================================
  Files          25       29       +4     
  Lines        1436     1619     +183     
  Branches      183      267      +84     
==========================================
+ Hits         1359     1541     +182     
  Misses         48       48              
- Partials       29       30       +1     

Flag	Coverage Δ
unittests	95.18% <97.35%> (+0.54%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
func_adl_xAOD/common/cpp_functions.py	100.00% <ø> (ø)
func_adl_xAOD/atlas/xaod/__init__.py	60.00% <60.00%> (ø)
func_adl_xAOD/cms/aod/__init__.py	66.66% <60.00%> (-33.34%)	:arrow_down:
func_adl_xAOD/common/ast_to_cpp_translator.py	89.45% <93.75%> (+0.08%)	:arrow_up:
func_adl_xAOD/common/cpp_types.py	97.50% <96.92%> (-2.50%)	:arrow_down:
func_adl_xAOD/atlas/xaod/event_collections.py	100.00% <100.00%> (ø)
func_adl_xAOD/atlas/xaod/local_dataset.py	100.00% <100.00%> (ø)
func_adl_xAOD/atlas/xaod/query_ast_visitor.py	100.00% <100.00%> (ø)
func_adl_xAOD/cms/aod/cms_functions.py	89.47% <100.00%> (+0.58%)	:arrow_up:
func_adl_xAOD/cms/aod/event_collections.py	100.00% <100.00%> (ø)
... and 11 more

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