Caliper v1.7.0

A load in which no package type-checks can now return an engine instead of an error, through the new EngineOptions.KeepWhenAllFail. Off by default, so existing callers are unchanged.

Added

• EngineOptions.KeepWhenAllFail: a load in which no package
  type-checks returns an engine instead of the error package errors: …. Packages() is empty and Failed() holds every package with its
  errors. It is for callers that load a few packages of a module and
  want a broken one described as a whole module's load would describe
  it: alidade reloading a worktree's changed packages
  (belluikit/alidade#41). A load none of whose packages has a Go file
  is still an error. Off by default.

Changed

• Every source file carries its license header:
  SPDX-License-Identifier: MIT and the copyright line. The generated
  protobuf Go gets it from its .proto. Test fixtures under testdata
  are left as they were.
• The copyright holder in LICENSE is spelled "TrendVidia, LLC.", as in
  the organization's other repositories.