Edit some project files

[chykon]

Description & Motivation

The following changes have been made:

• Changed LICENSE text to template so the license is now automatically recognized GitHub. The dates have also been updated.
• The order of the fields in pubspec.yaml has been changed to match that specified in documentation.
• In the .gitignore file:
  • the pubspec.lock rule has been moved to the ...created by pub group;
  • tmp* changed to tmp_test/ because after Rework script "run_coverage" #173 the tmp_coverage/ directory is no longer created in the project root;
  • added explicit extension or directory pointers for .vcd and .vscode/.
• security.md renamed to SECURITY.md to match the standard convention (like LICENSE, README.md, etc.).
• Removal of extra spaces and other small changes.

Related Issue(s)

No.

Testing

Testing is not required.

Backwards-compatibility

Is this a breaking change that will not be backwards-compatible? If yes, how so?

No.

Documentation

Does the change require any updates to documentation? If so, where? Are they included?

No.

[mkorbel1]

Looks great, thank you!

I'll be implementing similar changes over in https://github.com/intel/rohd-vf and https://github.com/intel/rohd-cosim