Fixes https://gitlab.com/kicad/code/kicad/issues/11499
Also makes it a static text to get rid of the spacing/clipping problems it has been having. Fixes https://gitlab.com/kicad/code/kicad/issues/6152
The groundwork has now been laid for per sheet instance data. Initially this only supports sheet page numbers but could be expanded to include other per sheet instance information. ADDED: Support for user defined schematic page numbers.
Fixes https://gitlab.com/kicad/code/kicad/issues/5736