Switched to Colpick + Interface upgrades

> Switched all colour pickers and their related functions
> upgraded interface; buttons, button groups, tidy-up and saving space
> I removed straighten because it's redundant and takes up space
TODO:
> Tidy up some code (parts i commented out since I renamed/reorganised
some ids)
> Remove redundant functions (setblkcolor, straighten)
> Remodel the site's overall look (I think the grey at the top is too
bland/plain, and we can use a background/picture somewhere)
> Bug fixes for group-related functions that don't work with images