Added ConsoleBrowser2 and WebpageSnapshot demos

- Split the Lazarus demos directory into "Lazarus_Windows" and "Lazarus_Linux".
- Added OSRExternalPumpBrowser and TinyBrowser2 demos to "Lazarus_Linux".
- Set TBufferPanel.GetScreenScale as virtual.
- Added DevTools to the SchemeRegistrationBrowser demo.
- Modified the SchemeRegistrationBrowser demo to receive XMLHttpRequest requests from JavaScript.

demos/Lazarus_Windows/JavaScript/JSSimpleExtension/uJSSimpleExtension.lfm

@@ -0,0 +1,72 @@
+object JSSimpleExtensionFrm: TJSSimpleExtensionFrm
+  Left = 130
+  Height = 589
+  Top = 154
+  Width = 978
+  Caption = 'Initializing browser. Please wait...'
+  ClientHeight = 589
+  ClientWidth = 978
+  Color = clBtnFace
+  Font.Color = clWindowText
+  Font.Height = -11
+  Font.Name = 'Tahoma'
+  OnCloseQuery = FormCloseQuery
+  OnCreate = FormCreate
+  OnShow = FormShow
+  Position = poScreenCenter
+  LCLVersion = '2.0.6.0'
+  object NavControlPnl: TPanel
+    Left = 0
+    Height = 21
+    Top = 0
+    Width = 978
+    Align = alTop
+    BevelOuter = bvNone
+    ClientHeight = 21
+    ClientWidth = 978
+    Enabled = False
+    TabOrder = 0
+    object Edit1: TEdit
+      Left = 0
+      Height = 21
+      Top = 0
+      Width = 947
+      Align = alClient
+      TabOrder = 0
+      Text = 'file:///JSSimpleExtension.html'
+    end
+    object GoBtn: TButton
+      Left = 947
+      Height = 21
+      Top = 0
+      Width = 31
+      Align = alRight
+      Caption = 'Go'
+      OnClick = GoBtnClick
+      TabOrder = 1
+    end
+  end
+  object CEFWindowParent1: TCEFWindowParent
+    Left = 0
+    Height = 568
+    Top = 21
+    Width = 978
+    Align = alClient
+    TabOrder = 1
+  end
+  object Chromium1: TChromium
+    OnBeforePopup = Chromium1BeforePopup
+    OnAfterCreated = Chromium1AfterCreated
+    OnBeforeClose = Chromium1BeforeClose
+    OnClose = Chromium1Close
+    left = 32
+    top = 224
+  end
+  object Timer1: TTimer
+    Enabled = False
+    Interval = 300
+    OnTimer = Timer1Timer
+    left = 32
+    top = 288
+  end
+end