* Fixes issue with templates loading via classpath
The templating engines were originally written to load templates via the
classpath, but this functionality was blocked by file-only checks
further up the stack. This loosens those file-only checks, allowing
files and relatively imported files to be included via classpath.
* [docs] Add details about classpath-level templates
* [feat][maven] templateResourcePath for template on classpath
- NOTE templateResourcePath is not needed for gradle, as it accepts
a string for the target template directory, which supports classpath
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