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/FullScreenBrowser/uMainForm.lfm

@@ -0,0 +1,46 @@
+object MainForm: TMainForm
+  Left = 165
+  Height = 673
+  Top = 130
+  Width = 1364
+  BorderIcons = []
+  BorderStyle = bsNone
+  Caption = 'MainForm'
+  ClientHeight = 673
+  ClientWidth = 1364
+  Color = clBtnFace
+  Font.Color = clWindowText
+  Font.Height = -11
+  Font.Name = 'Tahoma'
+  FormStyle = fsStayOnTop
+  OnCloseQuery = FormCloseQuery
+  OnCreate = FormCreate
+  OnShow = FormShow
+  LCLVersion = '2.0.6.0'
+  WindowState = wsMaximized
+  object CEFWindowParent1: TCEFWindowParent
+    Left = 0
+    Height = 673
+    Top = 0
+    Width = 1364
+    Align = alClient
+    TabOrder = 0
+  end
+  object Chromium1: TChromium
+    OnPreKeyEvent = Chromium1PreKeyEvent
+    OnKeyEvent = Chromium1KeyEvent
+    OnBeforePopup = Chromium1BeforePopup
+    OnAfterCreated = Chromium1AfterCreated
+    OnBeforeClose = Chromium1BeforeClose
+    OnClose = Chromium1Close
+    left = 208
+    top = 120
+  end
+  object Timer1: TTimer
+    Enabled = False
+    Interval = 300
+    OnTimer = Timer1Timer
+    left = 272
+    top = 120
+  end
+end