- Keep original image data. When loading JPEG, this avoid recompression
that changes file data and decreases image quality
- Allow schematic and page layout editors to store non-PNG data as well
- Move page layout editor to store base64 instead of hex-coded data
in GetMsgPanelInfo() (PPI, scale).
m_image name was confusing: it is not a wxImage, but a BITMAP_BASE item,
and m_image name was already in use in BITMAP_BASE, used inside SCH_IMAGE.
Bitmap properties dialog: show PPI value and add Title to dialog.
Also adds some debugging to try to catch dangling pointers.
Also adds a cache for group bounding boxes (which will be expensive
to calculate for large groups).
Fixes https://gitlab.com/kicad/code/kicad/issues/12875
Seth Hillbrand
jean-pierre charras
Jon Evans
Jeff Young
Mike Williams