Excise LocusContext class

[standage]

This update removes the LocusContext class in favor of the TargetAmplicon class in MicroHapDB designed for the same purpose.

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• [x] Changes are clearly described above
• [x] Any relevant issue threads are referenced in the description
• [x] Any new features are tested (see docs/DEVEL.md for details)
• [x] Substantial changes are documented in CHANGELOG.md (see https://keepachangelog.com/en/1.0.0/)

[codecov-io]

Codecov Report

Merging #67 into master will increase coverage by 0.43%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   95.72%   96.15%   +0.43%     
==========================================
  Files          25       25              
  Lines         818      781      -37     
  Branches      157      153       -4     
==========================================
- Hits          783      751      -32     
+ Misses         18       16       -2     
+ Partials       17       14       -3

Impacted Files	Coverage Δ
microhapulator/panel.py	89.83% <ø> (+0.72%)	:arrow_up:
microhapulator/profile.py	99.11% <100%> (ø)	:arrow_up:

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