code.dlang.org: code search would be a great feature

[dlangBugzillaToGithub]

Andrej Mitrovic (@AndrejMitrovic) reported this on 2022-08-07T12:38:25Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=23285

Description

Scenario from today: I'm looking into fixing some of my old code which uses Windows COM classes.

Ideally I'd like to use an existing D COM utility library. But, I can't find any relevant package on code.dlang.org just by searching for COM or Windows. 

However, if I could use code search then I could simply search for `IUnknown` and that would probably find a bunch of projects which use COM.

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In the end I did find what I was looking for, but only because I had the knowledge that VisualD uses COM: https://github.com/dlang/visuald/blob/e67848ff0388c3c7b06a2f034ecee5723f844ef9/stdext/com.d#L33-L46