Make is such that SDK boiler plate artifact zips are build from versioned resources

Currently, the SDK boiler plate artifact zips are simply binaries located in the repository tree.

This makes it hard to maintain and impossible to generate updated versions from release to release without manually constructing the zips. Plus it makes it harder for people to contribute patches when bug are found.

With this change the artifacts will be generated from template folder similar to how EXT template is maintained. The artifacts will be generated inline when building a new SDK bundle, which means anyone can correct issues at least locally if they've checked out plugins trunk.