Reduce all worker exceptions to common

[maslenitsa93]

Currently there are too many different worker logic exception types (>30).
But most of evaluators are throwing 2 or 3 exceptions only.

If client is a software, the common error description is enough.
E.g.: incorrect_techspec_state.

If client is a human (e.g. user of cli_wallet, or programmer who plays with API), he can read the message of the exception. Single exception can be used with few messages. Also, it anyway should be described in documentation: which operation for which techspec state.

[maslenitsa93]

There are 2 ways to make common exceptions:

1. Just use common logic_exception:

error: incorrect_techspec_state
msg: Techspec should be in work, wip or not approved

error: incorrect_techspec_state
msg: Techspec should be complete

error: incorrect_techspec_state
msg: Techspec should be in work or wip

2. Use our own exception type (as it made in bandwidth_exception) with special field correct_states:

error: incorrect_techspec_state
correct_states: [created, work, wip]
msg: Techspec should be in work, wip or not approved

error: incorrect_techspec_state
correct_states: [complete]
msg: Techspec should be complete

error: incorrect_techspec_state
correct_states: [work, wip]
msg: Techspec should be in work or wip

[maslenitsa93]

Same way should be used to declare incorrect_worker_proposal_state (created/techspec) and incorrect_worker_proposal_type (premade/task).

Also, another logic exceptions can be just replaced with single logic exception without custom fields.

[maslenitsa93]

error: incorrect_techspec_state
correct_states: [created, work, wip]
msg: Techspec should be in work, wip or not approved

It should be 2 exceptions - Techspec is already finished and Techspec is not yet approved. Message for client should be informative. Client should just translate it to user language and show to user.
Solution with incorrect_techspec_state don't allow to separate exceptions without wasting LOCs. I will implement another solution.

[maslenitsa93]

PR #1321