Reformat all file names to the same convention

[bcbielecki]

Here's the initial design, but I'm open to suggestions:

• All file names start with the prefix "ops_".
• Each subsequent term added to the prefix is an identifier that relates all files with matching prefixes.
• For example, "ops_schematic_led.png" and "ops_schematic_pot.png" are related because of the "ops_schematic_" prefix. This means they must both be schematics

[dylanvu]

when I tackle this, I'll also implement this issue also:
#62