Consider more standard compose mappings

[Porges]

At the moment you invented your compose keys based on some things you remembered about XCompose.

Perhaps you should:

• use all of a default XCompose
• use digraphs from Vim
• use RFC1345 upon which Vim's digraphs are based

[notpushkin]

It would probably be even better if the app could support parsing any .XCompose files.

[Porges]

@iamale I did have support for that, it just needs to be exposed in the GUI somehow 😃