Improve detection of C block comments

Illegalized `/*` in a bunch of languages and added some new phrasal
words to comments. This was prompted by a real example in
https://meta.discourse.org/t/code-fences-dont-seem-to-deal-with-c-comments/33339
which is now stored as a detection test for C++ in
test/detect/cpp/comments.txt.

Fixes #937.

src/highlight.js

@@ -693,7 +693,7 @@ https://highlightjs.org/
     contains: [hljs.BACKSLASH_ESCAPE]
   };
   hljs.PHRASAL_WORDS_MODE = {
-    begin: /\b(a|an|the|are|I|I'm|isn't|don't|doesn't|won't|but|just|should|pretty|simply|enough|gonna|going|wtf|so|such)\b/
+    begin: /\b(a|an|the|are|I|I'm|isn't|don't|doesn't|won't|but|just|should|pretty|simply|enough|gonna|going|wtf|so|such|will|you|your|like)\b/
   };
   hljs.COMMENT = function (begin, end, inherits) {
     var mode = hljs.inherit(

src/languages/autoit.js

@@ -1742,6 +1742,7 @@ function(hljs) {
 
     return {
         case_insensitive: true,
+        illegal: /\/\*/,
         keywords: {
             keyword: KEYWORDS,
             built_in: BUILT_IN,

src/languages/cal.js

@@ -73,6 +73,7 @@ function(hljs) {
   return {
     case_insensitive: true,
     keywords: { keyword: KEYWORDS, literal: LITERALS },
+    illegal: /\/\*/,
     contains: [
       STRING, CHAR_STRING,
       DATE, DBL_QUOTED_VARIABLE,

src/languages/dos.js

@@ -19,6 +19,7 @@ function(hljs) {
   return {
     aliases: ['bat', 'cmd'],
     case_insensitive: true,
+    illegal: /\/\*/,
     keywords: {
       flow: 'if else goto for in do call exit not exist errorlevel defined',
       operator: 'equ neq lss leq gtr geq',

src/languages/fortran.js

@@ -55,6 +55,7 @@ function(hljs) {
     case_insensitive: true,
     aliases: ['f90', 'f95'],
     keywords: F_KEYWORDS,
+    illegal: /\/\*/,
     contains: [
       hljs.inherit(hljs.APOS_STRING_MODE, {className: 'string', relevance: 0}),
       hljs.inherit(hljs.QUOTE_STRING_MODE, {className: 'string', relevance: 0}),

src/languages/fsharp.js

@@ -21,6 +21,7 @@ function(hljs) {
       'match member module mutable namespace new null of open or ' +
       'override private public rec return sig static struct then to ' +
       'true try type upcast use val void when while with yield',
+    illegal: /\/\*/,
     contains: [
       {
         // monad builder keywords (matches before non-bang kws)

src/languages/irpf90.js

@@ -59,7 +59,8 @@ function(hljs) {
   };
   return {
     case_insensitive: true,
-    keywords: F_KEYWORDS, 
+    keywords: F_KEYWORDS,
+    illegal: /\/\*/,
     contains: [
       hljs.inherit(hljs.APOS_STRING_MODE, {className: 'string', relevance: 0}),
       hljs.inherit(hljs.QUOTE_STRING_MODE, {className: 'string', relevance: 0}),

src/languages/monkey.js

@@ -26,6 +26,7 @@ function(hljs) {
 
       literal: 'true false null and or shl shr mod'
     },
+    illegal: /\/\*/,
     contains: [
       hljs.COMMENT('#rem', '#end'),
       hljs.COMMENT(

src/languages/ruby.js

@@ -170,6 +170,7 @@ function(hljs) {
   return {
     aliases: ['rb', 'gemspec', 'podspec', 'thor', 'irb'],
     keywords: RUBY_KEYWORDS,
+    illegal: /\/\*/,
     contains: COMMENT_MODES.concat(IRB_DEFAULT).concat(RUBY_DEFAULT_CONTAINS)
   };
 }

test/detect/cpp/comment.txt

@@ -0,0 +1,16 @@
+/*
+To use this program, compile it -- if you can -- and then type something like:
+
+chan -n 5000 -d 2 < input.txt
+
+In this case, it will produce 5000 words of output, checking two-word groups.
+(The explanation above describes two-word generation. If you type "-d 3",
+the program will find three-word groups, and so on. Greater depths make more
+sense, but they require more input text and take more time to process.)
+
+http://www.eblong.com/zarf/markov/
+*/
+
+
+/* make cpp win deterministically over others with C block comments */
+cout << endl;