Feature/ss58 format

[alannotnerd]

Add system properties for parallel and heiko, but left it default for local test network.

ss58 address format id is registered in paritytech/substrate#9254

[0x8f701]

@alannotnerd hi I think acala has given a good example regarding the token decimals. You can also check here: https://github.com/parallel-finance/parallel/pull/134/files#diff-9a08c969144a056406ced2d9dde2f410e0135639d066f770d14b702ebf909a80
@yz89 do wen need the token decimals ?

[alannotnerd]

The properties just declare our token's decimals, e.g. PARA.

[alannotnerd]

@kaichaosun What's your opinion? :p

[codecov-commenter]

Codecov Report

Merging #321 (d48db88) into master (3203655) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
- Coverage   70.21%   70.11%   -0.10%     
==========================================
  Files          38       39       +1     
  Lines        2971     2975       +4     
==========================================
  Hits         2086     2086              
- Misses        885      889       +4     

Impacted Files	Coverage Δ
node/parallel/src/chain_spec/mod.rs	0.00% <ø> (ø)
primitives/src/lib.rs	0.00% <ø> (ø)
primitives/src/network.rs	0.00% <0.00%> (ø)

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[kaichaosun]

Two more concerns, others are good to be merged.