add ipc:graphics-setup
rename __set_float_nans to set_float_nans_

leading double underscores are reserved in the ISO c99 standard
add Point to ADT (with tests)
add ipc:graphics-setup to xtm.xtm
rename xtm_vg_create_path -> xtm_create_path
bugfixes for ipc:graphics-setup
rename xtm_create_path in vg example
add qr code library with example file
WIP: graphics stuff still not working properly
update the qr-code example
bugfixes for ipc:graphics-setup

seems to work ok now
add emacs font locking for hex literals
update extempore-process-compiler-output
update openvg.xtm

fewer polymorphic shenanigans, more efficient
update openvg example
qr code example works with updated openvg lib