update elements and fix some bugs

lib/src/prism/components/prism-swift.js

-// issues: nested multiline comments, highlighting inside string interpolations
+// issues: nested multiline comments
 Prism.languages.swift = Prism.languages.extend('clike', {
-        'keyword': /\b(as|associativity|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic|dynamicType|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonmutating|operator|optional|override|postfix|precedence|prefix|private|Protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__COLUMN__|__FILE__|__FUNCTION__|__LINE__)\b/,
+        'string': {
+                pattern: /("|')(\\(?:\((?:[^()]|\([^)]+\))+\)|\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
+                inside: {
+                        'interpolation': {
+                                pattern: /\\\((?:[^()]|\([^)]+\))+\)/,
+                                inside: {
+                                        delimiter: {
+                                                pattern: /^\\\(|\)$/,
+                                                alias: 'variable'
+                                        }
+                                        // See rest below
+                                }
+                        }
+                }
+        },
+        'keyword': /\b(as|associativity|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonmutating|operator|optional|override|postfix|precedence|prefix|private|Protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
         'number': /\b([\d_]+(\.[\de_]+)?|0x[a-f0-9_]+(\.[a-f0-9p_]+)?|0b[01_]+|0o[0-7_]+)\b/i,
         'constant': /\b(nil|[A-Z_]{2,}|k[A-Z][A-Za-z_]+)\b/,
-        'atrule': /@\b(IBOutlet|IBDesignable|IBAction|IBInspectable|class_protocol|exported|noreturn|NSCopying|NSManaged|objc|UIApplicationMain|auto_closure)\b/,
-        'builtin': /\b([A-Z]\S+|abs|advance|alignof|alignofValue|assert|contains|count|countElements|debugPrint|debugPrintln|distance|dropFirst|dropLast|dump|enumerate|equal|filter|find|first|getVaList|indices|isEmpty|join|last|lazy|lexicographicalCompare|map|max|maxElement|min|minElement|numericCast|overlaps|partition|prefix|print|println|reduce|reflect|reverse|sizeof|sizeofValue|sort|sorted|split|startsWith|stride|strideof|strideofValue|suffix|swap|toDebugString|toString|transcode|underestimateCount|unsafeBitCast|withExtendedLifetime|withUnsafeMutablePointer|withUnsafeMutablePointers|withUnsafePointer|withUnsafePointers|withVaList)\b/
+        'atrule': /@\b(IB(?:Outlet|Designable|Action|Inspectable)|class_protocol|exported|noreturn|NS(?:Copying|Managed)|objc|UIApplicationMain|auto_closure)\b/,
+        'builtin': /\b([A-Z]\S+|abs|advance|alignof(?:Value)?|assert|contains|count(?:Elements)?|debugPrint(?:ln)?|distance|drop(?:First|Last)|dump|enumerate|equal|filter|find|first|getVaList|indices|isEmpty|join|last|lexicographicalCompare|map|max(?:Element)?|min(?:Element)?|numericCast|overlaps|partition|print(?:ln)?|reduce|reflect|reverse|sizeof(?:Value)?|sort(?:ed)?|split|startsWith|stride(?:of(?:Value)?)?|suffix|swap|toDebugString|toString|transcode|underestimateCount|unsafeBitCast|with(?:ExtendedLifetime|Unsafe(?:MutablePointers?|Pointers?)|VaList))\b/
 });
+Prism.languages.swift['string'].inside['interpolation'].inside.rest = Prism.util.clone(Prism.languages.swift);