Release v1.7.0: Newton-Raphson State Estimation

[mgovers]

Closes #369
Closes #237

• Bump version

• Make Newton-Raphson state estimation stable (instead of experimental)

• full clang-tidy run

[TonyXiang8787]

@mgovers also remove the deprecated import export json functions.

[mgovers]

@mgovers also remove the deprecated import export json functions.

can we do that? i think the tests in PGM-IO still use the old function calls as a fallback. Would imply a version bump on PGM-IO as well.

I would propose to wait until #493 is implemented, no?

[TonyXiang8787]

@mgovers please do not create a release branch

[TonyXiang8787]

@mgovers also remove the deprecated import export json functions.

can we do that? i think the tests in PGM-IO still use the old function calls as a fallback. Would imply a version bump on PGM-IO as well.

I would propose to wait until #493 is implemented, no?

Then keep the json functions for now.

[mgovers]

@mgovers please do not create a release branch

yeah i noticed. will recreate the PR from a different branch