feat/policiesForRecords

[MaxBlaushild]

Implements policy constrained record appending and persistent record based policies.

Users now have the option to check against policies when appending data. These policies are stored, and again checked when user grants access for file to new users.

Also allows users to add and remove policies for their records.

[codecov-io]

Codecov Report

Merging #108 into master will decrease coverage by 1.84%. The diff coverage is 87.75%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage    96.6%   94.75%   -1.85%     
==========================================
  Files           8        9       +1     
  Lines         206      248      +42     
  Branches       48       57       +9     
==========================================
+ Hits          199      235      +36     
- Misses          7       13       +6

Impacted Files	Coverage Δ
contracts/mock/PolicyMock.sol	100% <ø> (ø)
contracts/LinniaPermissions.sol	98.03% <100%> (-0.18%)	:arrow_down:
contracts/LinniaHub.sol	95.45% <100%> (+1.33%)	:arrow_up:
contracts/LinniaPolicies.sol	80% <80%> (ø)
contracts/LinniaRecords.sol	97.11% <90.9%> (-1.67%)	:arrow_down:

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[godfreyhobbs]

consider adding the following to the 3_records_test.js and 5_records-token_test.js

  beforeEach('set up a LinniaPolicies contract', async () => {
    policiesInstance = await LinniaPolicies.new(hub.address);
    await hub.setPoliciesContract(policiesInstance.address);
  });
```