projects: drop MSVC project files for recent versions

We encourage users to generate visual studio project files using CMake.

We keep project files in git for ancient visual studio

projects: drop MSVC project files for recent versions

We encourage users to generate visual studio project files using CMake.

We keep project files in git for ancient visual studio versions that
cmake cannot generate files for, but we no longer ship the project files
in the tarballs.

appveyor: switch VisualStudioSolution job to VC12 (Visual Studio 2013)

Co-Authored-by: Viktor Szakats
Co-Authored-by: Jay Satiro

Closes #13311

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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docs: spellfixes

Pointed by the new CI job

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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projects/README: converted to markdown

Closes #8652