Improve reputation miner user experience

[chmanie]

This PR does the following:

• Arguments to the reputation miner client executable are simplified and described better. Removed: network, localProviderAddress, localPort, providerAddress, all in favor of rpcEndpoint

• Almost all arguments got sensible defaults. Now only privateKey or minerAddress have to be specified.

• All arguments have corresponding environment variables with the REP_MINER prefix (e.g. privateKey is REP_MINER_PRIVATE_KEY)

• The docker image got adjusted to that (and also should yield a more consistent build)

• The whole configuration is shown when the reputation miner is started

• All docs are adjusted to the new arguments and workflow

• In the docs, the possibility to stake for reputation mining was added (directly from a form in the docs)

• Alex fixed two issues that were related to first time miners.

[area]

The commit I've added pages the previous mining cycles on syncing. This is exactly the same issue that we were facing in the frontend in a few different areas that Raul fixed. The same solution is done here - instead of asking for all events in one big request, we split it up in to multiple requests and join all the responses together.