Fix license header consistency

[oatawa1]

What this patch does to fix the issue.

Target files are *.py, *.cpp, *.h, *.hpp

• Add missing header license to all target file
• Fix consistency of no. of = in the last line of license to 77. There are 78 for some of C++ src and header files.

Link to any relevant issues or pull requests.

[bo-code-review-bot]

This PR needs Approvals as follows.

• Ownership Approval for / from iizukak, tkng, ruimashita
• Readability Approval for Python from tkng, tsawada, tfujiwar
• Readability Approval for C++ from tkng, tsawada, primenumber

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[iizukak]

@oatawa1
Thanks. The year is how to define?
File create date?

[oatawa1]

@iizukak I checked each individual file history in github.

[iizukak]

@oatawa1 OK Thanks.

[iizukak]

OA

[oatawa1]

@iizukak Thank you.

[oatawa1]

Because this PR committed python and C++ file.
I may request review from two persons at a time.

@a-hanamoto Could you review the python file in this PR?
@primenumber Could you review the C++ file in this PR?

[primenumber]

RA for C++

[oatawa1]

@primenumber Thank you.

[a-hanamoto]

RA (reverse-shadowing) for Python

[tfujiwar]

RA

[oatawa1]

@a-hanamoto @tfujiwar Thank you.

[oatawa1]

/ready

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