Standardize file size units

[jawira]

Many tasks transforms Bytes to another unit, and from any unit to Bytes.

• TrucateTask: k, m,
• size selector: k, m, g, t and many variations.
• hasfreespace condition: K, M, G, T, P
• FileSizeTask: B, K, M, G, T, P.

I have already mentioned this in #1420

Every mentioned Task handles the unit conversion by itself (except TrucateTask which uses \Phing::convertShorthand), so I want to create SizeHelper class, the idea is to put all the conversion logic in a single place (the same way StringHelper is used to parse strings).

1024 is used as multiplier almost everywhere, except in size selector (which also supports 1000 as multiplier). Therefore -in order to apply KISS philosophy- I think the best is to only multiply bytes by 1024 and unsupport 1000. I know this is a breaking change, but that why major releases exist right?

What do you think? Should I continue with this idea and create a PR?

[siad007]

Sounds like a plan - very much appreciated!