preliminary vim support

I don't really know vim configuration

vim/compiler/newt.vim

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+let current_compiler = 'newt'
+
+" doesn't work
+CompilerSet errorformat='ERROR at (%l, %c)'

vim/ftdetect/newt.vim

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+autocmd BufRead,BufNewFile *.newt set filetype=newt

vim/ftplugin/newt.vim

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+setlocal syntax=newt
+setlocal commentstring=--\ %s
+setlocal expandtab
+setlocal tabstop=2
+
+setlocal makeprg=build/exec/newt\ %

vim/syntax/newt.vim

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+syn keyword newtInfix infix infixl infixr
+syn keyword newtKW data where let in case of
+syn keyword newtLet let in
+syn match newtIdentifier "[a-zA-Z][a-zA-Z]*" contained
+syn keyword newtStructure data import module where
+syn region newtBlockComment start="/-" end="-/" contained
+syn match newtLineComment "--.*$" contains=@Spell
+
+" no idea why this works for idris but not here
+"highlight dev link newtIdentifier Identifier
+highlight def link newtInfix PreProc
+highlight def link newtBlockComment Comment
+highlight def link newtLineComment Comment
+highlight def link newtLet Structure
+highlight def link newtStructure Structure
+
+let b:current_syntax = "newt"