Swift: replace non-genereated Base suffixes

This is the effect of running
```
find swift/ql/lib/codeql/swift/elements -type f | xargs sed -ri 's/\b([A-Z]\w+)Base\b/Generated::\1/g'
```
followed by reformatting.

Author: redsun82

swift/ql/lib/codeql/swift/elements/AstNode.qll

@@ -23,7 +23,7 @@ private module Cached {
   }
 }
 
-class AstNode extends AstNodeBase {
+class AstNode extends Generated::AstNode {
   final AbstractFunctionDecl getEnclosingFunction() { result = Cached::getEnclosingFunction(this) }
 
   final Decl getEnclosingDecl() { result = Cached::getEnclosingDecl(this) }

swift/ql/lib/codeql/swift/elements/Callable.qll

@@ -1,4 +1,4 @@
 private import codeql.swift.generated.Callable
 private import codeql.swift.elements.AstNode
 
-class Callable extends CallableBase, AstNode { }
+class Callable extends Generated::Callable, AstNode { }

swift/ql/lib/codeql/swift/elements/Comment.qll

@@ -1,6 +1,6 @@
 private import codeql.swift.generated.Comment
 
-class Comment extends CommentBase {
+class Comment extends Generated::Comment {
   /** toString */
   override string toString() { result = this.getText() }
 }

swift/ql/lib/codeql/swift/elements/Element.qll

@@ -1,6 +1,6 @@
 private import codeql.swift.generated.Element
 
-class Element extends ElementBase {
+class Element extends Generated::Element {
   private predicate resolvesFrom(Element e) { e.getResolveStep() = this }
 
   override string toString() { result = this.getPrimaryQlClasses() }

swift/ql/lib/codeql/swift/elements/File.qll

@@ -1,6 +1,6 @@
 private import codeql.swift.generated.File
 
-class File extends FileBase {
+class File extends Generated::File {
   /** toString */
   override string toString() { result = this.getAbsolutePath() }
 

swift/ql/lib/codeql/swift/elements/Locatable.qll

@@ -2,12 +2,13 @@ private import codeql.swift.generated.Locatable
 private import codeql.swift.elements.File
 private import codeql.swift.elements.UnknownLocation
 
-class Locatable extends LocatableBase {
+class Locatable extends Generated::Locatable {
   pragma[nomagic]
   override Location getImmediateLocation() {
-    result = LocatableBase.super.getImmediateLocation()
+    result = Generated::Locatable.super.getImmediateLocation()
     or
-    not exists(LocatableBase.super.getImmediateLocation()) and result instanceof UnknownLocation
+    not exists(Generated::Locatable.super.getImmediateLocation()) and
+    result instanceof UnknownLocation
   }
 
   /**

swift/ql/lib/codeql/swift/elements/Location.qll

@@ -3,7 +3,7 @@ private import codeql.swift.generated.Location
 /**
  * A location of a program element.
  */
-class Location extends LocationBase {
+class Location extends Generated::Location {
   /**
    * Holds if this location is described by `path`, `startLine`, `startColumn`, `endLine` and `endColumn`.
    */

swift/ql/lib/codeql/swift/elements/UnknownFile.qll

@@ -1,5 +1,5 @@
 private import codeql.swift.generated.UnknownFile
 
-class UnknownFile extends UnknownFileBase {
+class UnknownFile extends Generated::UnknownFile {
   override string getName() { result = "" }
 }

swift/ql/lib/codeql/swift/elements/UnknownLocation.qll

@@ -5,7 +5,7 @@ private import codeql.swift.elements.File
 /**
  * A `Location` that is given to something that is not associated with any position in the source code.
  */
-class UnknownLocation extends UnknownLocationBase {
+class UnknownLocation extends Generated::UnknownLocation {
   override File getImmediateFile() { result instanceof UnknownFile }
 
   override int getStartLine() { result = 0 }

swift/ql/lib/codeql/swift/elements/decl/AbstractFunctionDecl.qll

@@ -1,5 +1,5 @@
 private import codeql.swift.generated.decl.AbstractFunctionDecl
 
-class AbstractFunctionDecl extends AbstractFunctionDeclBase {
+class AbstractFunctionDecl extends Generated::AbstractFunctionDecl {
   override string toString() { result = this.getName() }
 }