[Framework] Apply template method design pattern to BaseMass

[hugtalbot]

Apply template method design pattern to BaseMass and its API:

• addMDx
• addMToMatrix
• buildMassMatrix
• accFromF
• addGravityToV
• getKineticEnergy
• getPotentialEnergy
• getMomentum
• initGnuplot
• exportGnuplot
• getElementMass
• isDiagonal

I created this PR in two parts since I doubt we actually need these functions to be concerned by the refactoring:

• initGnuplot
• exportGnuplot
• getElementMass
• isDiagonal

[ci-depends-on https://github.com/sofa-framework/BeamAdapter/pull/188]
[with-all-tests]

---

By submitting this pull request, I acknowledge that
I have read, understand, and agree SOFA Developer Certificate of Origin (DCO).

---

Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[sofabot]

[ci-depends-on] detected during build #1.

To unlock the merge button, you must

• Merge or close [Mass] Apply template method design pattern to BaseMass BeamAdapter#188
  For this build, the following CMake flags will be set
  -DBEAMADAPTER_GIT_REPOSITORY='https://github.com/sofa-framework/BeamAdapter'
  -DBEAMADAPTER_GIT_TAG='9c1375ac9ee68d267e16507b36d16216e6da46b3'

[hugtalbot]

[ci-build] [with-all-tests]

[sofabot]

[ci-depends-on] detected during build #3.

To unlock the merge button, you must

• Merge or close [Mass] Apply template method design pattern to BaseMass BeamAdapter#188
  For this build, the following CMake flags will be set
  -DBEAMADAPTER_GIT_REPOSITORY='https://github.com/sofa-framework/BeamAdapter'
  -DBEAMADAPTER_GIT_TAG='ba812fe9e7a9c5c6224f6897165204952524cab1'

[sofabot]

[ci-depends-on] detected during build #4.

To unlock the merge button, you must

• Merge or close [Mass] Apply template method design pattern to BaseMass BeamAdapter#188
  For this build, the following CMake flags will be set
  -DBEAMADAPTER_GIT_REPOSITORY='https://github.com/sofa-framework/BeamAdapter'
  -DBEAMADAPTER_GIT_TAG='ba812fe9e7a9c5c6224f6897165204952524cab1'

[sofabot]

[ci-depends-on] detected during build #5.

To unlock the merge button, you must

• Merge or close [Mass] Apply template method design pattern to BaseMass BeamAdapter#188
  For this build, the following CMake flags will be set
  -DBEAMADAPTER_GIT_REPOSITORY='https://github.com/sofa-framework/BeamAdapter'
  -DBEAMADAPTER_GIT_TAG='ba812fe9e7a9c5c6224f6897165204952524cab1'

[sofabot]

[ci-depends-on] detected during build #6.

To unlock the merge button, you must

• Merge or close [Mass] Apply template method design pattern to BaseMass BeamAdapter#188
  For this build, the following CMake flags will be set
  -DBEAMADAPTER_GIT_REPOSITORY='https://github.com/sofa-framework/BeamAdapter'
  -DBEAMADAPTER_GIT_TAG='e9ae648648bfa994ab17014cc03120c22822c572'