Added the SimpleBrowser demo for Linux.
Added Linux support to TChromiumWindow.
Removed unused code and added more code comments to the SimpleBrowser demos for Windows.
- Added groups to the demos with a secondary subprocess project
- Added some conditional directives for MacOS (MACOS IS NOT SUPPORTED YET!)
- Removed some Windows dependencies in the FMXExternalPumpBrowser demo
- Added TChromium.ParentFormHandle property