Add Ability for Output Code to have Opcode Length Specifiers

In the process of making disassemblies, I prefer having the .b/.w/.l on every opcode so I can control exactly how asar assembles the opcodes.  Since SHex doesn't put them into outputted code, I have to manually add them in, which can take hours of tedious effort. If SHex had a toggle that allows you to set whether the output code has them or not, it would be a massive help to me.