initial economic model for tracking purchases

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #1177 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1177      +/-   ##
=========================================
+ Coverage   93.37%   93.4%   +0.02%     
=========================================
  Files         122     123       +1     
  Lines       16344   16353       +9     
=========================================
+ Hits        15262   15274      +12     
+ Misses       1082    1079       -3

Impacted Files	Coverage Δ
synapse/lib/modules.py	100% <ø> (ø)	⬆️
synapse/lib/types.py	97.94% <100%> (+0.01%)	⬆️
synapse/models/economic.py	100% <100%> (ø)
synapse/lib/base.py	88.62% <0%> (+1%)	⬆️

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[vEpiphyte]

Missing test

        strsubs = model.type('str').clone({'regex': r'(?P<first>[ab]+)(?P<last>[zx]+)'})
        norm, info = strsubs.norm('aabbzxxxxxz')
        self.eq(info.get('subs'), {'first': 'aabb', 'last': 'zxxxxxz'})