[[ Bug 12225 ]] Add dispatcher method to find stack by window id
[[ Bug 12225 ]] Add external coordinate conversion functions
[[ Bug 12225 ]] Transform coordinates when getting/setting browser rect
[[ Bug 12602 ]] Move screen coord conversion methods into MCUIDC class
[[ Bug 12602 ]] Apply DPI scale when converting external stack coords
Merge branch 'bugfix-12602' of https://github.com/runrevian/livecode into bugfix-12602