Initial cmake build file and fixes for Windows

[elms]

Add cmake support and Windows improvements

• Examples working on Windows and SWTPM
  • Check command availability (including for windows blocking it).
  • update unseal to work without persistent NV storage
• fix a few spelling mistakes

[elms]

@haydenroche5 and @dgarske This is still a work in progress, but only expect minor fixes and clean as I test a little more on Windows. Any early feedback would be appreciated.

[elms]

The compiled applications were put into the build dir, but did you consider putting the existing locations in examples directories?

I know we do this for wolfssl, but for cmake and windows in general I think it's considered poor practice.

[haydenroche5]

The compiled applications were put into the build dir, but did you consider putting the existing locations in examples directories?

I know we do this for wolfssl, but for cmake and windows in general I think it's considered poor practice.

Agree with Jeff. I did it that way in wolfSSL to make it mirror autotools as much as possible, but generally speaking about CMake, all build artifacts should stay in the build directory.

[elms]

I was failing to unload the handles. The error in unseal was when no additional handles were available. Thanks for catching that.