[Lazarus] Suggestion again: remove GTK1 from IDE and LCL

[dmitry boyarintsev]

I've been ignoring all gtk discussions.

About splitting gtk2 from gtk. How about the following:

- copy all gtk1 widgetset units used by gtk2 to gtk2 dir
- remove gtk1 dir usage, for gtk2 widgetset
- remove all {$ifdef GTK1} and gtk1 specific code from the copied units

imho, simple enough. Are there some caveats?

thanks,
dmitry