Add interface for forecast_shock_decomposition.

I think this is almost ready for merge. Two things still need to be adjusted:

• I don’t like the fact that the type option can take integer values (if I understand correctly, 1 is for unconditional forecast, and 2 for the conditional forecast), because this is not self-explicit for the user (we made that same mistake for the realtime option of realtime_shock_decomposition, but we should avoid doing that again). I rather suggest to use explicit keywords, more precisely type = unconditional and type = conditional. I guess type = unconditional should be the default if unspecified.

• Please reference the Gitlab issue in the commit message. You need to mention the string Dynare/dynare#1657 in the message.

mentioned in merge request dynare!1671 (closed)

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• 927be12f - Add interface for forecast_shock_decomposition dynare#1657.

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• 8bfcefe7 - Add interface for forecast_shock_decomposition. dynare#1657

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merged

mentioned in commit 3ae92499

I may have merged this a bit too fast. It looks like you forgot to add the conditional and unconditional tokens to the lexer. If this is indeed the case, that will require a new merge request.

In my last commit, the tokens were added. I just checked the merge and they are there.

I meant in the lexer, i.e. in DynareFlex.ll.