Support specifying RPC address via --node in CLI commands

[mappum]

Support --node in CLI commands, defaulting to localhost:26657. A future change should also make the default check the Tendermint config to support nonstandard ports automatically.

[codecov-commenter]

Codecov Report

Merging #188 (feb3b6f) into develop (7a74a31) will decrease coverage by 0.16%.
The diff coverage is 2.35%.

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@@             Coverage Diff             @@
##           develop     #188      +/-   ##
===========================================
- Coverage    14.80%   14.64%   -0.16%     
===========================================
  Files           22       22              
  Lines         6135     6206      +71     
===========================================
+ Hits           908      909       +1     
- Misses        5227     5297      +70     

Files Changed	Coverage Δ
src/bin/nomic.rs	0.00% <0.00%> (ø)
src/bitcoin/checkpoint.rs	9.51% <ø> (ø)
src/lib.rs	0.00% <0.00%> (ø)
src/network.rs	0.00% <0.00%> (ø)
src/utils.rs	0.00% <0.00%> (ø)
src/bitcoin/relayer.rs	12.63% <14.28%> (-0.01%)	⬇️

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