Bug: Export does not support relative paths

[m0kka]

As title states, the export function does not currently support relative paths and will fail unless an absolute path is used. See also https://discord.com/channels/615978381397327874/1154522068533117020

[MrClock8163]

Copied over the relative path resolution from the Arma3ObjectBuilder

[m0kka]

Awesome, thanks!