* Use target_include_directories to specify include paths
* Specify project root (parent of rtgui and rtengine) as include path
* Replace relative includes with normal includes
Found via `codespell -q 3 -I ../rawtherapy-whitelist.txt -S ./rtdata`
`rawtherapy-whitelist.txt` consists of:
```
adn
amin
autor
ba
byteorder
cas
childs
developpement
dum
foto
fro
inbetween
interm
ist
iten
ith
lonly
nd
ois
optio
preserv
skipp
som
spred
substracted
tbe
tim
uint
unselect
```