Fix Windows DLL boundary issues

[NuSkooler]

On Windows, if DLL 'A' for example mallocs, it must be DLL 'A' that makes the free call in order to ensure the proper runtime. Currently Windows builds crash due to this problem. To reproduce (on Windows):

let mut ctx = Context::new(TctiNameConf::Tbs).context("init TBS TCTI")?;
let rnd = ctx.get_random(16).context("TPM2_GetRandom failed")?; 

This MR uses Esys_Free to free allocated data. I may have missed some areas, so would love pointers. It's a bit tricky to test all the stuff here.

[Superhepper]

Thank you for finding this problem. I have just a few points that I would like to be addressed.

[NuSkooler]

Thanks @Superhepper I believe I have the changes ready!

[Superhepper]

Now you just need to sign your commits and make sure that everything is properly formatted and it should pass all the checks.

[NuSkooler]

Now you just need to sign your commits and make sure that everything is properly formatted and it should pass all the checks.

Updated, thanks!

[Superhepper]

Just squash the changes into one commit and then you sign it.

[NuSkooler]

Just squash the changes into one commit and then you sign it.

Squashed.

[Superhepper]

It seems as if you forgot to sign it.

[NuSkooler]

It seems as if you forgot to sign it.

Signed again :)

[wiktor-k]

It seems as if you forgot to sign it.

Signed again :)

I think it needs a sign off (not necessarily a GPG signsture). It's a different switch: -s instead of -S. :)

[NuSkooler]

It seems as if you forgot to sign it.

Signed again :)

I think it needs a sign off (not necessarily a GPG signsture). It's a different switch: -s instead of -S. :)

Signed off on this side