Add WinCompose to unicode_entry

[m-dango]

Closes #1531.

[AlexDaniel]

By default, WinCompose allows you to enter any unicode character by pressing
your compose key, followed by C, followed by the unicode code point.

I don't like this remark. The way the sections ends with this, it makes me feel like the suggested way is to enter characters by codepoint, which is generally what you can avoid by using the compose key.

Otherwise pretty good, thanks!

[m-dango]

Shall I throw in an 'also' after 'WinCompose' or change it further?

[AlexDaniel]

I'd say remove that paragraph completely. I've seen people assume that alt codes is the only way to write non-ascii chars, I don't think there's a need to reinforce the belief that this way of typing non-ascii characters is even remotely sensible. I know that some people do it, and that's fine, but I don't think it is something we should suggest or even mention.

For the survey I listed these ways to type non-ascii chars:

• Compose key
• Using features of a text editor
• Custom keyboard layout
• Perl6::Tidy
• Input-method frameworks (e.g. dbus)
• Helper tools provided by the OS
• digraphs utility
• Software for keyboard macros
• Alt codes
• Copy-pasting

Given all the great options (excluding things like copy-pasting), I don't think entering by codepoint is worth a mention at all.

[AlexDaniel]

Looks good to me, thanks!

FWIW if someone disagrees regarding the entry by codepoint, feel free to comment or even put the paragraph back.