RobotBob reads a json file instructing it to make and take offers
as per an 'actions' json array, e.g. ["make","take","take","make],
and the tester will manually run CLI commands provided by the bot
during each step in a trade.

The test case (ScriptedBotTest) can be run with the test harness,
which will start and shutdown all the regtest/dao app: bitcoind,
seednode, arbnode, bob & alice nodes.  The test case can also be
run without the test harness, and the user manages his own daemons.

Usage will be described in the PR before it leaves draft stage.

Codacy is right.  Don't use instance of ex, add a catch clause.
Also removed an unnecessary fully qualified name 'String.format'.

The BaseCurrencyNetwork#getDefaultMinFeePerVbyte now returns
15 (sats/byte) since commit b341bb6.

This change adjusts the api to the new min tx fee rate by validating
the api's setTxFeeRatePreference param, and throwing an appropirate
exception if the param value is below the minimum.  Also adjusted a broken
test, and added a new test to check the appropriate exception is received
from the server.

Commit c33ac1b changed the source of
the min tx fee rate, and the api will adjust after the associated PR
is merged.  For now, the required change is a comment.

CliMain no longer uses gRPC stubs directly, just parses &
validates command options, and prints responses.

Also, anticipates reuse by java bots (avoiding grpc boilerplate
duplication on the client side), reduces size of CliMain class, and
will allow clean up of duplicated grpc boilerplate in apitest cases.

This is a follow up to PR bisq-network#5240,
which moved client side gRPC boilerplate to a new, reusable GrpcClient class.

From this change forward, all (including test) client side gRPC request/response
boilerplate should now live in GrpcClient.