Upgrade MD5Hex Assertion to Digest Assertion

[asfimport]

orimarko (Bug 61737):
I suggest upgrading MD5Hex Assertion to Digest Assertion

Currently it only assert using MD5 algorithm, but we can allow other SHA assertions.
Support similar algorithms as the new __digest function.

OS: All

[asfimport]

@pmouawad (migrated from Bugzilla):
Hello,
Looks like a good idea.
Just to keep backward compatibility , can you proceed the following way if you intend to submit a patch:

• Keep class name as it but update javadocs and docs
• A select box should provide available algorithm, defaulting to MD5 for backward compatibility
• I supppose there will be other parameters depending on algorithm
• MD5Hex should become HashHex

[asfimport]

@pmouawad (migrated from Bugzilla):
It would also be interesting to make this assertion appliable on Variables