Add stringEscape to syntax

src/color.ts

@@ -58,6 +58,7 @@ export function generateFallbackColorSet(s: IBaseColorSet, type: 'light' | 'dark
       number: s.color4,
       storage: s.color1,
       string: s.color2,
+      stringEscape: (type === 'light' ? darken : lighten)(s.color2, 0.5),
       comment: (type === 'light' ? darken : lighten)(s.background, 2.0),
       class: s.color3,
       classMember: s.color3,

src/interfaces.ts

@@ -25,6 +25,7 @@ export interface IColorSet {
     number?: string;
     storage?: string;
     string?: string;
+    stringEscape?: string;
     comment?: string;
     class?: string;
     classMember?: string;

src/rules.ts

@@ -71,6 +71,7 @@ export const tokenRules: IRuleGenerator[] = [
   // string: It's important that string is put first so that other scopes can override strings
   // within template expressions
   { color: s => s.syntax.string,       generate: getSimpleColorGenerator('String', 'string') },
+  { color: s => s.syntax.stringEscape, generate: getSimpleColorGenerator('String Escape', 'constant.character.escape, text.html constant.character.entity.named, punctuation.definition.entity.html') },
   { color: s => s.syntax.boolean,      generate: getSimpleColorGenerator('Boolean', 'constant.language.boolean') },
   { color: s => s.syntax.number,       generate: getSimpleColorGenerator('Number', 'constant.numeric') },
   { color: s => s.syntax.identifier,   generate: getSimpleColorGenerator('Identifier', 'variable, support.variable, support.class, support.constant, meta.definition.variable entity.name.function') },