fix(langserver): change scope name of argument tokens to allow better automatic opening of completions

Author: d-biehl

package.json

@@ -114,7 +114,7 @@
             }
           },
           {
-            "scope": "string.unquoted.embeddedArgument.robotframework",
+            "scope": "constant.character.embeddedArgument.robotframework",
             "settings": {
               "fontStyle": "italic"
             }
@@ -182,7 +182,7 @@
             }
           },
           {
-            "scope": "constant.character.escape.robotframework",
+            "scope": "constant.character.character.escape.robotframework",
             "settings": {}
           }
         ]
@@ -245,10 +245,10 @@
             "keyword.operator.for.robotframework"
           ],
           "argument": [
-            "string.unquoted.argument.robotframework"
+            "constant.character.argument.robotframework"
           ],
           "embeddedArgument": [
-            "string.unquoted.embeddedArgument.robotframework"
+            "constant.character.embeddedArgument.robotframework"
           ],
           "variable": [
             "variable.other.readwrite.robotframework"
@@ -279,7 +279,7 @@
             "punctuation.definition.variable.end.robotframework"
           ],
           "escape": [
-            "constant.character.escape.robotframework"
+            "constant.character.character.escape.robotframework"
           ],
           "namespace": [
             "entity.other.namespace.robotframework"

syntaxes/robotframework.tmLanguage.json

@@ -140,7 +140,7 @@
     },
     "keyword_call": {
       "name": "meta.keyword-call.content.robotframework",
-      "contentName": "string.unquoted.argument.robotframework",
+      "contentName": "constant.character.argument.robotframework",
       "begin": "^(?!(?: {2,}| ?\\t ?)+(?:(?=[$\\[@&%]|\\.)))(?: {2,}| ?\\t ?)+(.*?)(?= {2,}| ?\\t ?| ?$)",
       "end": "^(?!\\s*\\.\\.\\.)",
       "beginCaptures": {
@@ -173,7 +173,7 @@
     },
     "returning_keyword": {
       "name": "meta.returning-keyword.robotframework",
-      "contentName": "string.unquoted.argument.robotframework",
+      "contentName": "constant.character.argument.robotframework",
       "begin": "(?<=\\s)(?=\\s*(?:(?=[$@&])))((?:\\s)*(?:[$&@]{(?:.*?)}(?:\\[.*?\\])?(?: ?=?\\s*))*)(.*?)(?: {2,}| ?\\t ?|$)",
       "beginCaptures": {
         "1": {