Wrap some storage values in Option.

[Neopallium]

changelog

modified API

• Add Option wrapper to Asset.Tickers, Asset.Tokens, Asset.AssetNames, Asset.CustomTypesInverse, Asset.AssetDocuments, Portfolio.Portfolios, Identity.Claims, Identity.CustomClaims, Identity.CustomClaimsInverse and Sto.FundraiserNames.
• Change storage of Settlement.UserVenues from a Vec to a double map.
• Removed unused Identity.CddAuthForMasterKeyRotation storage.

[codecov[bot]]

Codecov Report

Merging #1489 (9309386) into develop (c3c62b2) will increase coverage by 0.00%. The diff coverage is 62.39%.

@@           Coverage Diff            @@
##           develop    #1489   +/-   ##
========================================
  Coverage    54.48%   54.48%           
========================================
  Files          151      151           
  Lines        32936    32985   +49     
========================================
+ Hits         17944    17973   +29     
- Misses       14992    15012   +20     

Impacted Files	Coverage Δ
pallets/identity/src/lib.rs	23.59% <0.00%> (-0.74%)	:arrow_down:
pallets/settlement/src/lib.rs	76.98% <4.34%> (-0.93%)	:arrow_down:
pallets/identity/src/claims.rs	83.16% <80.00%> (ø)
pallets/asset/src/lib.rs	81.94% <83.33%> (+0.19%)	:arrow_up:
pallets/portfolio/src/lib.rs	80.46% <93.33%> (+0.03%)	:arrow_up:
pallets/asset/src/checkpoint/mod.rs	57.89% <100.00%> (+0.19%)	:arrow_up:
pallets/sto/src/lib.rs	50.10% <100.00%> (ø)

... and 1 file with indirect coverage changes