Add ModalVector LocalPR

[prayush]

Proposed changes

Types of changes:

• Bugfix
• New feature

Component:

• Code
• Documentation
• Build system
• Continuous integration

Code review checklist

• The PR passes all checks, including unit tests, clang-tidy and IWYU. For
  instructions on how to perform the CI checks locally refer to the Dev guide
  on the Travis CI.
• The code is documented and the documentation renders correctly. Run make doc
  to generate the documentation locally into BUILD_DIR/docs/html. Then open
  index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.

Further comments

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@bb9a347). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop       #6   +/-   ##
==========================================
  Coverage           ?   98.82%           
==========================================
  Files              ?      336           
  Lines              ?    12047           
  Branches           ?        0           
==========================================
  Hits               ?    11905           
  Misses             ?      142           
  Partials           ?        0

Impacted Files	Coverage Δ
src/DataStructures/ModalVector.hpp	100% <100%> (ø)
src/DataStructures/ModalVector.cpp	100% <100%> (ø)

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