Move Unit from Energy to Core

[ExE-Boss]

This PR will move Unit from Energy to Core.

Reason:

Unit seems like a class that would benefit more from being in Core than in Energy.

Other changes:

UnitDisplay is now immutable, and accepts a DoubleSupplier to allow linking to a getter. Example:

UnitDisplay display = new UnitDisplay(Unit.JOULE, components.get(EnergyStorage.class)::getEnergy);

Modded Minecraft energy units were left out and will be added by NOVA-Team/NOVA-Energy#3.

[codecov-io]

Codecov Report

Merging #271 into master will increase coverage by 0.16%. The diff coverage is 21.17%.

@@             Coverage Diff              @@
##             master     #271      +/-   ##
============================================
+ Coverage     13.58%   13.74%   +0.16%     
- Complexity      732      762      +30     
============================================
  Files           409      413       +4     
  Lines         12788    13010     +222     
  Branches       1354     1380      +26     
============================================
+ Hits           1737     1788      +51     
- Misses        10934    11107     +173     
+ Partials        117      115       -2

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/nova/core/util/unit/UnitConversion.java	0% <0%> (ø)	0 <0> (?)
src/main/java/nova/core/util/unit/UnitDisplay.java	0% <0%> (ø)	0 <0> (?)
src/main/java/nova/core/util/unit/Unit.java	0% <0%> (ø)	0 <0> (?)
src/main/java/nova/core/util/unit/UnitPrefix.java	100% <100%> (ø)	10 <10> (?)
src/main/java/nova/core/util/math/MathUtil.java	86.17% <81.48%> (+4.08%)	65 <18> (+20)	:arrow_up:

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[ExE-Boss]

Changes implemented and rebased to master