Code alteration

[LukePearson1]

This pull request is mostly covering refactoring and doing a replacement of the code in line with the new curve model, as well as a change in terms. Whether this is kept open or not, as I continue to commit is not very important. However just ensure that the same refactoring isn't done on other forks, as it would be unecessary.

Whilst perusing, I have come across 4 aspects in the code which I would like to go through with @CPerezz before making changes.

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Extra work that has been done in addition to refactoring, includes:

• Showing the curve derivation constants and the modified script
• Build python script for new point operations with Sonny curve

[LukePearson1]

This will be added to across the next 24 hours in terms of added code for the new 'path' of zerocaf.

[codecov[bot]]

Codecov Report

Merging #89 into ristretto-skeleton will not change coverage. The diff coverage is 100%.

@@                Coverage Diff                 @@
##           ristretto-skeleton     #89   +/-   ##
==================================================
  Coverage                98.6%   98.6%           
==================================================
  Files                       5       5           
  Lines                    4015    4015           
==================================================
  Hits                     3959    3959           
  Misses                     56      56

Impacted Files	Coverage Δ
src/lib.rs	100% <ø> (ø)	:arrow_up:
src/ristretto.rs	93.5% <ø> (ø)	:arrow_up:
src/backend/u64/scalar.rs	99.15% <ø> (ø)	:arrow_up:
src/backend/u64/field.rs	99.56% <100%> (ø)	:arrow_up:
src/edwards.rs	98.79% <100%> (ø)	:arrow_up:

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[LukePearson1]

If the two above comments are resolved sufficiently, feel free to merge.