Introduce contextmanager for disabling templating and reduce resolving errors #3287
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The context manager is a better alternative to the currently widely used pattern of
Advantage: Shorter and safer as the reset cannot be forgotten even in case of exceptions
Afterwards some template resolving failures are removed which are observed in #3285
Diff looks larger than it is as indentation has changed and Github seems to be bad in handling this. All changes are trivial.