Added more ToD schedules.
Adds the indoors schedule.
Added files for new editor custom tod dialog
Made 25x25 buttons use new images
New 25x25 button defnitions: Add and Delete
Used Add and Delete definitions for New/Delete ToD buttons
Placeholder artwork for experimental "unit_box" feature
Removed old up/down/left/right button images
Fixed typos
Fixed include path to header
Made repeating button use new images
Used grayscale imagepathfunction on disabled state overlays in absence of specific image
Made use of pressed and active overlay variations
Removed unusued "menu-button" images
Add Vorbis support to the CMake build system.

Applies patch #3920.
Made storyscreen next/prev arrows use new images
Removed old "big-arrow" images
Missing artwork for the 'pressed' state of long arrow buttons
Made icon toggle button/resize map dialog use new images
Removed old "resize-direction" buttons