chore(windows): rearrange global/delphi/ui units

Moves:
* Keyman.System.Util.RenderLanguageIcon.pas -> common
* UfrmKeymanBase.dfm -> kmshell
* UfrmKeymanBase.pas -> kmshell
* UfrmWebContainer.dfm -> kmshell
* UfrmWebContainer.pas -> kmshell
* XMLRenderer.pas -> kmshell
* UFixupMissingFile.pas -> kmshell

Also:
* Removes duplicate GenericXMLRenderer.pas
* Removes unused unit references in keyman.dpr