refactor: various improvements and fixes

[evilrobot-01]

Various fixes and improvements whilst reviewing #238

[peterwht]

Looks great!!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.84211% with 10 lines in your changes missing coverage. Please review.

Project coverage is 9.99%. Comparing base (bec2216) to head (2ac89b3).
Report is 1 commits behind head on al3mart/chore-registration.

Files with missing lines	Patch %	Lines
node/src/chain_spec.rs	81.39%	5 Missing and 3 partials ⚠️
node/src/command.rs	0.00%	2 Missing ⚠️

@@                      Coverage Diff                      @@
##           al3mart/chore-registration    #243      +/-   ##
=============================================================
+ Coverage                        7.46%   9.99%   +2.53%     
=============================================================
  Files                              34      34              
  Lines                            2453    2521      +68     
  Branches                         2453    2521      +68     
=============================================================
+ Hits                              183     252      +69     
+ Misses                           2270    2266       -4     
- Partials                            0       3       +3     

Files with missing lines	Coverage Δ
runtime/mainnet/src/lib.rs	16.22% <100.00%> (+10.75%)	⬆️
runtime/testnet/src/lib.rs	3.89% <ø> (ø)
node/src/command.rs	0.00% <0.00%> (ø)
node/src/chain_spec.rs	11.25% <81.39%> (+11.25%)	⬆️