Improved template API and fixed a bug. Closes #5979.

* Text.Pandoc.Templates [API change]

  + Add Monad wrappers `WithDefaultPartials` and `WithPartials`.
    Wrapping these around an instance of `PandocMonad` gives
    us different instances of `TemplateMonad`, with different
    search behavior in retrieving partials.
    To compile a template and limit partial search to pandoc's
    data files, use `runWithDefaultPartials (compileTemplate ...)`.
    To compile a template and allow partials to be found locally
    (either on the file system or via HTTP, in the event that
    the main template has an absolute URL), ue
    `runWithPartials (compileTemplate ...)`.

  + Export `getTemplate`, which seeks a template locally,
    or via HTTP if the template has an absolute URL, falling
    back to the data files if not found.

  + Export `compileDefaultTemplate` -- does `getDefaultTemplate`
    and compiles the result, raising an error on failure.

* Text.Pandoc.Class [API change]

  + Remove `TemplateMonad` instances for `PandocIO` and `PandocPure`.
    These were too limiting and caused a bug whereby a local
    partial could be used even when the default template was requested.
    We now rely on instances provided in the Templates module.

Text.Pandoc.App.OutputSettings

  + Simplify template retrieval code.

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