Move initialisation of areas closer to where it's used
Move initialisation of areas closer to where it's used

Makes the code more easy to follow.

Contributes to issue CURA-2625.

fieldOfView/Cura,hmflash/Cura,ynotstartups/Wanhao,hmflash/Cura,ynotstartups/Wanhao,Curahelper/Cura,fieldOfView/Cura,Curahelper/Cura