Add Vim syntax support for Name and HexSequence tokens.

Also disable spell checking for .cton files. They tend to contain very
few words, and even comments are pretty cryptic.

misc/vim/syntax/cton.vim

@@ -9,16 +9,22 @@ elseif exists("b:current_syntax")
   finish
 endif
 
+" Disable spell checking even in comments.
+" They tend to refer to weird stuff like assembler mnemonics anyway.
+syn spell notoplevel
+
 syn keyword ctonHeader test isa set
 syn keyword ctonDecl function stack_slot jump_table
 syn keyword ctonFilecheck check sameln nextln unordered not regex contained
 
 syn match ctonType  /\<[bif]\d\+\(x\d\+\)\?\>/
-syn match ctonEntity /\<\(v\|vx\|ss\|jt\|\)\d\+\>/
+syn match ctonEntity /\<\(v\|vx\|ss\|jt\|fn\|sig\)\d\+\>/
 syn match ctonLabel /\<ebb\d+\>/
+syn match ctonName /%\w\+\>/
 
 syn match ctonNumber /-\?\<\d\+\>/
 syn match ctonNumber /-\?\<0x\x\+\(\.\x*\)\(p[+-]\?\d\+\)\?\>/
+syn match ctonHexSeq /#\x\+\>/
 
 syn region ctonCommentLine start=";" end="$" contains=ctonFilecheck
 
@@ -27,7 +33,9 @@ hi def link ctonDecl          Keyword
 hi def link ctonType          Type
 hi def link ctonEntity        Identifier
 hi def link ctonLabel         Label
+hi def link ctonName          String
 hi def link ctonNumber        Number
+hi def link ctonHexSeq        Number
 hi def link ctonCommentLine   Comment
 hi def link ctonFilecheck     SpecialComment