Rename plugin files using official filetype and deperecated add symlinks

Author: alerque

ftdetect/rmarkdown.vim

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+rmd.vim

ftdetect/rmarkdown.vim

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+augroup rmarkdown
+    au! BufRead,BufNewFile *.Rmd  set filetype=rmd
+    au! BufRead,BufNewFile *.Rpres  set filetype=rmd
+augroup END

ftdetect/rmd.vim

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+rmd.vim

ftplugin/rmarkdown.vim

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+" vim: set fdm=marker:
+
+" Pandoc: {{{1
+" load vim-pandoc {{{2
+runtime ftplugin/pandoc.vim
+
+" init vim-pandoc-after, if present {{{2
+try
+    call pandoc#after#Init()
+catch /E117/
+endtry
+
+" Rmarkdown: {{{1
+command! -buffer -bang -nargs=* 
+            \-complete=custom,rmarkdown#command#CommandComplete 
+            \RMarkdown call rmarkdown#command#Command('<bang>', '<args>')
+
+if exists(":NR") == 2
+    command! -buffer RNrrw call rmarkdown#nrrwrgn#NarrowRChunk()
+    noremap <buffer> <localleader>ccn :RNrrw<cr>
+endif

ftplugin/rmarkdown.vim

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+rmd.vim

ftplugin/rmd.vim

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+runtime syntax/pandoc.vim
+PandocHighlight r
+" rmarkdown recognizes embedded R differently than regular pandoc
+exe 'syn region pandocRChunk '. 
+            \'start=/\(```\s*{\s*r.*\n\)\@<=\_^/ ' .
+            \'end=/\_$\n\(\(\s\{4,}\)\=\(`\{3,}`*\|\~\{3,}\~*\)\_$\n\_$\)\@=/ '. 
+            \'contained containedin=pandocDelimitedCodeblock contains=@R'
+
+syn region pandocInlineR matchgroup=Operator start=/`r\s/ end=/`/ contains=@R concealends
+
+PandocHighlight python
+" rmarkdown recognizes embedded R differently than regular pandoc
+exe 'syn region pandocPythonChunk '. 
+            \'start=/\(```\s*{\s*python.*\n\)\@<=\_^/ ' .
+            \'end=/\_$\n\(\(\s\{4,}\)\=\(`\{3,}`*\|\~\{3,}\~*\)\_$\n\_$\)\@=/ '. 
+            \'contained containedin=pandocDelimitedCodeblock contains=@python'
+
+syn region pandocInlinePython matchgroup=Operator start=/`python\s/ end=/`/ contains=@Python concealends