Make it possible to customize runtime directories

[hholst80]

The Runtime directories seems to be a hardcoded or an at-compile-time set parameter.

I would like to be able to customize that to my liking by setting a build-time option.

(Spoiler: I will set it to /usr/share/helix/runtime but you can keep it as-is if that fits you better.)

Config file: default
Language file: default
Log file: /root/.cache/helix/helix.log
Runtime directories: /root/.config/helix/runtime;/usr/bin/runtime
Runtime directory does not exist: /root/.config/helix/runtime
Runtime directory does not exist: /usr/bin/runtime
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[kirawi]

You can set $HELIX_RUNTIME