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Description
I'm adding iCalendar as a data format.
This PR closes #6910
PS: This is a duplicate of #6911. I wanted to rename the branch associated with that PR, but apparently this closes the PR. Sorry for the inconvenience.
Checklist:
The extension of the new language is used in hundreds of repositories on github.com.
I have included a real-world usage sample for all extensions added in this PR:
I have included a syntax highlighting grammar: https://github.com/kimsey0/iCalendar-sublime
I have added a color
#ec564c
[ ] I have updated the heuristics to distinguish my language from others using the same extension.(Unused extensions)