arx-install-data: Add checksum for French data.pak

A third data.pak variant can be found on the original French Arx Fatalis
CD, add support for it to the data install script.
Replace pointer with const reference, remove export of helper function
Rename flare array to magicFlares
Replace direct array access with reference
Move magic flare related code to own files
Continue early on null entity
Indentation
Code style, move variable to smaller scope
Move magic flare related code
Manage frame delta inside ARX_MAGICAL_FLARES_Draw
Check flarenum inside ARX_MAGICAL_FLARES_Draw
Cleanup
Unify copy-paste
Remove copy-paste
Remove copy-paste
Code style
Code style
Add Paths debug render
Move debug drawing related code to own file
Move debug drawing related code