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/PopupBrowser/uChildForm.lfm

@@ -0,0 +1,64 @@
+object ChildForm: TChildForm
+  Left = 550
+  Height = 256
+  Top = 146
+  Width = 352
+  Caption = 'Popup'
+  ClientHeight = 256
+  ClientWidth = 352
+  Color = clBtnFace
+  Font.Color = clWindowText
+  Font.Height = -11
+  Font.Name = 'Tahoma'
+  OnClose = FormClose
+  OnCloseQuery = FormCloseQuery
+  OnCreate = FormCreate
+  OnDestroy = FormDestroy
+  OnHide = FormHide
+  OnShow = FormShow
+  Position = poScreenCenter
+  ShowInTaskBar = stAlways
+  LCLVersion = '2.0.10.0'
+  object Panel1: TBufferPanel
+    Left = 0
+    Height = 256
+    Top = 0
+    Width = 352
+    OnIMECancelComposition = Panel1IMECancelComposition
+    OnIMECommitText = Panel1IMECommitText
+    OnIMESetComposition = Panel1IMESetComposition
+    Align = alClient
+    OnUTF8KeyPress = Panel1UTF8KeyPress
+    Caption = 'Panel1'
+    Color = clWhite
+    ParentColor = False
+    TabOrder = 0
+    TabStop = True
+    OnClick = Panel1Click
+    OnEnter = Panel1Enter
+    OnExit = Panel1Exit
+    OnMouseDown = Panel1MouseDown
+    OnMouseMove = Panel1MouseMove
+    OnMouseUp = Panel1MouseUp
+    OnMouseWheel = Panel1MouseWheel
+    OnKeyDown = Panel1KeyDown
+    OnKeyUp = Panel1KeyUp
+    OnResize = Panel1Resize
+  end
+  object chrmosr: TChromium
+    OnTitleChange = chrmosrTitleChange
+    OnTooltip = chrmosrTooltip
+    OnCursorChange = chrmosrCursorChange
+    OnBeforePopup = chrmosrBeforePopup
+    OnBeforeClose = chrmosrBeforeClose
+    OnGetViewRect = chrmosrGetViewRect
+    OnGetScreenPoint = chrmosrGetScreenPoint
+    OnGetScreenInfo = chrmosrGetScreenInfo
+    OnPopupShow = chrmosrPopupShow
+    OnPopupSize = chrmosrPopupSize
+    OnPaint = chrmosrPaint
+    OnIMECompositionRangeChanged = chrmosrIMECompositionRangeChanged
+    Left = 24
+    Top = 56
+  end
+end