Add full ECC Support for D-Trust Card 4.1/4.4

[hamarituc]

This PR adds support for ECDSA signatures and ECDH key agreement for D-Trust Signatures Cards 4.1/4.4 issued by the german Bundesdruckerei.

This PR supersedes #3240. But since @frankmorgner already reviewed that PR I wouldn't like to amend it afterwards. Feel free to continue reviewing #3240 and to postpone this one or just to review this PR instead. I am unsure which way do you prefer. Sorry the noise in case you preferred just amending an already reviewed PR.

Tested on:

• D-TRUST Card 4.1 M100 ECC 2ca
• D-TRUST Card 4.1 Multi ECC 2ca
• Fixes #3236

Checklist

• [x] New files have a LGPL 2.1 license statement
• [x] PKCS#11 module is tested
• [x] Windows minidriver is tested (only for signature, but not for key derivation)
• [ ] macOS tokend is tested (unable to test, help needed)

[frankmorgner]

Also, the linter doesn't seem to like the extra empty line:

diff --git a/src/libopensc/iso7816.c b/src/libopensc/iso7816.c
index 30cebb4..e17549c 100644
--- a/src/libopensc/iso7816.c
+++ b/src/libopensc/iso7816.c
@@ -30,7 +30,6 @@
 #include "iso7816.h"
 #include "sm/sm-iso.h"

-
 void
 iso7816_fixup_transceive_length(const struct sc_card *card,
        struct sc_apdu *apdu)