Smart contract reporting fixes and updates

[deweller]

Fixes #144. Closes #77. Also closes #53.

Adds a Reported state and a FinalDelisted state.

Successful job reporters are rewarded with their report deposit plus a percentage of the job value.

Sets the following constraints on configurable values:

MAX_DAO_FEE = 25%
MAX_RESOLUTION_FEE_PERCENTAGE = 25%
MAX_REPORT_DEPOSIT = 200
MAX_REPORT_REWARD_PERCENT = 25%

Removes the metadataCid from the contract. This is emitted as a Log Event.

Removes unnecessary requiresApproval modifier.

Removes unused requiresOneOfJobStates modifier.

Completes 100% smart contract test coverage.

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[deweller]

Note that these changes will require a new contract deployment on testnet.