feat: New Adapter - Reimbursement

[adridadou]

Proposed changes

• Every function call can be reimbursed to the caller, just need to make sure the function is using the correct modifier: reimbursable
• The reimbursable is protected against reentrancy attacks and calculates the cost of the tx to send the eth back to the caller if the transaction is successfully executed
• If there are no ETH available for reimbursements, the transaction is executed as usual and no funds are reimbursed.
• Every adapter that submits & process proposals were updated to allow reimbursements.

[codecov]

Codecov Report

Merging #412 (0704637) into master (7650d3f) will decrease coverage by 1.66%.
The diff coverage is 56.48%.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
- Coverage   83.75%   82.09%   -1.67%     
==========================================
  Files          49       55       +6     
  Lines        1767     1882     +115     
  Branches      414      438      +24     
==========================================
+ Hits         1480     1545      +65     
- Misses        287      337      +50     

Impacted Files	Coverage Δ
contracts/adapters/Configuration.sol	100.00% <ø> (ø)
contracts/adapters/Distribute.sol	98.52% <ø> (ø)
contracts/adapters/Financing.sol	100.00% <ø> (ø)
contracts/adapters/GuildKick.sol	95.65% <ø> (ø)
contracts/adapters/Managing.sol	100.00% <ø> (ø)
contracts/adapters/Onboarding.sol	98.63% <ø> (ø)
contracts/adapters/Signatures.sol	100.00% <ø> (ø)
contracts/adapters/Tribute.sol	97.14% <ø> (ø)
contracts/adapters/voting/OffchainVoting.sol	41.42% <ø> (ø)
contracts/adapters/voting/Voting.sol	87.50% <ø> (ø)
... and 14 more

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[fforbeck]

Added some minor comments that we already discussed on discord.