Add file type detection

ftdetect/kokafiletype.vim

@@ -1 +1 @@
-au BufNewfile,BufEnter *.kk setf koka
+au BufNewfile,BufEnter *.kk setf hoon

syntax/koka.vim

@@ -5,31 +5,3 @@
 if exists("b:current_syntax")
     finish
 endif
-
-" Keywords
-syn keyword KokaKeyword infix infixr infixl prefix type struct alias con forall exists some fn val var
-            \ extern if then else elif match return with in handle handler mask override control rcontrol
-            \ effect named module import as public private abstract pub interface yield qualified hiding unsafe
-
-highlight def link KokaKeyword Keyword
-
-" Functions
-syn keyword KokaKeyword fun nextgroup=KokaFunName skipwhite skipempty
-syn match KokaFunName /\v[a-z][A-Za-z0-9\-_]*/ display contained
-highlight def link KokaFunName Function
-
-
-" Core Types
-syn keyword KokaCoreType any bool cfield char ctail double ediv either float32 global hdiv int int32
-            \ int64 local-var maybe optional order ref reuse ssize_t string uint8 vector void
-highlight def link KokaCoreType Type
-
-" Comments
-syn region KokaLineComment start="//" end="$"
-syn region KokaBlockComment matchgroup=KokaBlockComment start="/\*\%(!\|\*[*/]\@!\)\@!" end="\*/" contains=KokaBlockCommentNested
-syn region KokaBlockCommentNested matchgroup=KokaBlockComment start="/\*" end="\*/" contains=KokaBlockCommentNested
-
-highlight def link KokaLineComment Comment
-highlight def link KokaBlockComment Comment
-highlight def link KokaBlockCommentNested Comment
-