* Make `_Z_InputQ->complete` a boolean, as that's all it's used as.
* Use GLib allocation functions for `Z_InputQ` members.
* Use a `GQueue` for zephyr input.
* Use `*_find_custom` functions for input queue search.
Testing Done:
Compile only.
Reviewed at https://reviews.imfreedom.org/r/253/
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