comments in template files

[floriangantner]

References

Add references/links to any related issues or PRs. These may include:

• Fixes comments in template files #466 (if this fixes an issue ticket)

Description

Add possibility to add one-line comments # in the template files

Instructions for Reviewers

• apply some template file with comments starting with #
• the lines should not be applied in the generated template xml file

List of changes in this PR:

• add rule to skip lines starting with #
• also the lines are trimmed, so whitespaces are considered

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