wix: add support for additional wxs files As with my previous change for an --extra-prebuiild-script, I'm assuming this is predominantly useful in an enterprise environment and am only adding this to wix and not also to inno install scripts. Differential Revision: https://phab.mercurial-scm.org/D6179

wix: add a hook for a prebuild script to inject extra libraries I need this to build packages for Google so we can bundle some extensions in the installed image. My assumption is that this is most interesting for the .msi images so I only wired it up there. I'm not thrilled with the interface this provides, but it was an easy way to retain debug messages on Windows while also having enough structure to know what lines are actually module names for py2exe. Still pending on my end: I need to bundle a couple of config files, and at least one data file. I'm open to advice on how to do those things, and how to do this better. Differential Revision: https://phab.mercurial-scm.org/D6164

compression: introduce an official `format.revlog-compression` option This option supersedes the `experiment.format.compression` option. The value currently supported are zlib (default) and zstd (if Mercurial was compiled with zstd support). The option gained an explicit reference to `revlog` since this is the target usage here. Different storage methods might require different compression strategies. In our tests, using zstd give a significant CPU usage improvement (both compression and decompressing) while keeping similar repository size. Zstd as other interresting mode (dictionnary, pre-text, etc…) that are probably worth exploring. However, just plain switching from zlib to zstd provide a large benefit.