Pre monthly cleanup

[Neopallium]

Remove some dead code and other cleanup of the Base pallet.

These changes were pull from PR: #1349

[codecov]

Codecov Report

Merging #1350 (9728bdf) into develop (0d76397) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 9728bdf differs from pull request most recent head 78e620b. Consider uploading reports for the commit 78e620b to get more accurate results

@@           Coverage Diff            @@
##           develop    #1350   +/-   ##
========================================
  Coverage    43.97%   43.98%           
========================================
  Files          141      140    -1     
  Lines        30053    30041   -12     
========================================
- Hits         13217    13214    -3     
+ Misses       16836    16827    -9     

Impacted Files	Coverage Δ
pallets/base/src/lib.rs	51.78% <ø> (ø)
pallets/common/src/lib.rs	68.75% <ø> (ø)
pallets/identity/src/lib.rs	15.96% <0.00%> (-0.59%)	⬇️
pallets/balances/src/lib.rs	57.23% <0.00%> (+0.13%)	⬆️