Define TAD OSD element positions using pixel coordinates relative to background picture
Tweaked TAD OSD elements, addition of centre map cursor and MFCD TAD mode OSD element (currently no functionality, but can be used in the future when TAD gains messaging functionality).
Remove cTab_TAD_dialog_Gui_Editor.hpp as it has no purpose anymore
Removal of cTab_TAD_upDownArrow.html as I couldn't get it to work.
Add IDC_CTAB_BTNACT to IDC definitions
Initialize all uiNamespace variables
Do not scale centre map icon (vehicle icon) on TAD with the rest of the icons
Tweak TAD OSD element width
Adjust IDCs for TAD dialog and use predefined macros where possible
Add function cTab_fnc_OSD_update to update dynamic OSD content (for now only on "large" TAD)
Add cTab_fnc_txt_tggl to toggle text next to icons ON and OFF
Call cTab_fnc_OSD_update after opening an interface and change of map scale
Remove OSD update of mapscale from TAD since its now updated whenever the scale changes (should be better for overall performance)
Call new icon text toggle function from TAD dialog
Change OSD element for icon text toggle status to be 3 characters wide and show no text when initialized