Support for unstable text_input and input_method Wayland protocols about dwl

[djpohly]

Sounds like something that should exist. If it would add a lot of code, I might prefer to have it as a dwm-style contributed patch rather than part of the default codebase, but either way I say go ahead.

[Shugyousha]

I have started working on it and it looks to be around 360 lines of code (including comments). It will still be a while until I am done (I only have time on weekends to work on this).

These protocols are still evolving as well so I expect that we will have to update the code once the new protocol versions are released. Releasing support for the current versions and then update the code once the new protocol versions are out is the right way to handle this in my opinion.