License Updates 0.9.x Part 3: Remaining .h files

[stephengtuggy]

Code Changes:

• (Partly) Have the PR Validation Tests been run? See https://github.com/vegastrike/Vega-Strike-Engine-Source/wiki/Pull-Request-Validation

Issues:

• N/A?

Purpose:

• What is this pull request trying to do? Update the copyleft headers in another group of 0.9.x source files, this time the remaining .h files (not opcode-related)
• What release is this for? 0.9.x
• Is there a project or milestone we should apply this to? 0.9.x

[BenjamenMeyer]

Please double check the non-trivial license additions; the license may be correct but we still need to ensure all the authors are included. Found one specifically but may have missed others.