some updates

[CodingCoomer]

• cleaned up cli.py options. Less duplicated code, and options are now uniform across coomer, kemono, search, etc
• changed --ignore.. to --exclude.. to not conflict with --interactive on search.
• help text for each command is now complete and uniform.
• added some error handling for 429 errors.
• Keeps track of files returning 429 errors, each 429 error reduces number of current workers until only one remains.
• Loops the downloads until there are no more files to download, decreasing initial number of workers each loop.
• pbar doesn't increment on 429 errors
• This is a hacky fix, probably needs to be changed to not use a semaphore?