The runtime had support to detect handlebars (*.hbs) files as filetype
handlebars but was lacking any indent or syntax highlighting for that
filetype.
The handlebars syntax file is also a prerequisite for the glimmer
syntax.
Permission was granted by the original author to retrofit these into the
Vim runtime. Original License (MIT) maintained in code comments.
related: vim/vim#1956999ea2b5b06
Co-authored-by: Devin Weaver <suki@tritarget.org>
