Create flag for packages to detect which platform is being used.

[soapdog]

Create flag for packages to detect which platform is being used.

[soapdog]

This issue is done!

There is both ssb.serverType which is a String that should match the values in pkg.supportedPlatforms which is an Array of Strings. At the moment the only serverType is nodejs-ssb, but this is necessary groundwork to allow us to run other backends soon. It also enables package develolpers to branch their code depending on the server type and thus be able to support more than one server, example:

if (ssb.serverType === "nodejs-ssb") {
 // do something that is supported only on that server.
}

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All packages have been patched to include a supportedPlatforms property.

[soapdog]

This flag has been changed from serverType to platform to be consistent with the supportedPlatforms property in the package declaration.