Added output functionality

[x] Building page now displays the queued config
[x] Building page features a progress bar that displays the progress of
building (currently pretty pointless because my module works too fast to
notice, perhaps will be repurposed in future)
**After built, changes button to "Apply"--In a future version, this will
trigger reading the new theme index and overwriting the old, as well as
clearing the icon cache. currently just exits and prints the options to
output