Make the makefile.vc build work, even when Tcl has an old rules.vc
update rules-img.vc
Finish Tk 9.0 work
Start making Tkimg ready for the Tk 9.0 era. Far from complete yet
Adapt tkImg to work with TIP #647: Change Tk_ConfigureWidgets signature, abandon TK_CONFIG_OBJS
ClientData -> void*, and remove 2 unneccessary sentinels in Tcl_Panic calls
I always found it strange that in some cases base64 was used. But I have no idea which applications actually use this, therefore I was reluctant to change it. Since you (paul) have more experience in this, I'm OK with changing it to byte array: That would be much more logical. If someone wants base64, they can always convert it. So, I prefer 2)
Update TIFF extensions (Jpeg, Pixar and Zip) to the latest versions