common: Move address from SignedVote to Vote

[romac]

Closes: #23

[codecov]

Codecov Report

Merging #36 (cb93ff7) into romac/rust-state-machine (98d2b63) will decrease coverage by 0.56%.
The diff coverage is 86.11%.

@@                     Coverage Diff                      @@
##           romac/rust-state-machine      #36      +/-   ##
============================================================
- Coverage                     85.93%   85.37%   -0.56%     
============================================================
  Files                            19       20       +1     
  Lines                          1002     1025      +23     
============================================================
+ Hits                            861      875      +14     
- Misses                          141      150       +9     

Files	Coverage Δ
Code/common/src/signed_vote.rs	100.00% <100.00%> (ø)
Code/common/src/vote.rs	100.00% <ø> (ø)
Code/consensus/src/executor.rs	87.76% <100.00%> (-0.16%)	⬇️
Code/round/src/message.rs	72.41% <100.00%> (ø)
Code/round/src/state.rs	98.41% <100.00%> (+0.03%)	⬆️
Code/test/src/consensus.rs	95.00% <100.00%> (ø)
Code/test/src/vote.rs	94.44% <100.00%> (+0.33%)	⬆️
Code/round/src/state_machine.rs	67.24% <84.44%> (+5.25%)	⬆️
Code/round/src/transition.rs	57.89% <57.89%> (ø)

... and 1 file with indirect coverage changes

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