Three exclude flags should have standard behavior

[ghost]

Currently,

• --exclude-dirs can be passed multiple times, and can only exclude directories in the pwd of the sift process
• --exclude-ext requires a comma-separated list, and can only be passed once (the last one will determine the exclusion)
• --exclude-path can exclude a file or directory at any directory depth, but can only be passed once

It would be much more user-friendly to accept all flags zero or more times as ...-dirs currently behaves, and to generally standardize the exclusion specification behavior.

[svent]

Thanks for opening this issue - these options definitely need some work and I will look into this for an upcoming version.

[ghost]

Thanks! I look forward to it.