Make wrap_help a default feature

[epage]

In clap v3, terminal wrapping was always available

• wrap_help wasn't about wrapping but auto-detecting the width
• unicode make it correctly detect unicode character widths

In clap v4, we restructured this

• wrap_help encompassed both wrapping and auto-detecting the width
• unicode remained the same

We also kept wrap_help as non-default, moving wrapping from built-in to being non-default.

The theory behind it was that its a lot of code for processing for that some minor tweaks could make "good enough".

However, enough people seem to run into this being missing that we should probably make it default again. Anyone who is optimizing for size likely has default-features = false and this won't affect.