fund accounts in setup from passed prv. key

[zeroXbrock]

When passing a private key with -p to contender setup, make sure the from addresses in the [[setup]] stages and [[create]] stages are funded by the passed key.

If you're using a hard-coded from address, it will not be funded. However, from_pool addresses are funded.

[zeroXbrock]

this issue is not quite as pressing, or even relevant now, since from should now generally be replaced by from_pool. (#72, #65)

Specifying a from address in a setup step implies that the account will always be funded prior to running contender, which is usually not the case, namely when testing any network that isn't a local devnet.

I'd actually like to disincentivise the use of from in general, since from_pool works so well.
from addresses in builtin scenarios should be phased out immediately.

We could even remove the existing from functionality entirely, and rename from to act as from_pool (and remove from_pool). There really isn't any need to include hard-coded from addresses in scenario configs, as long as you want them to be portable (used by anyone other than you).