Ability to load saves back as a mine

[LakeYS]

Allow the host to save and re-load the mine, either by an autosaver, or manual save and load.

This will likely require hooks into the loading function, which can be referenced here: https://github.com/Electrk/bl-decompiled

Bricks could be parsed by matching them to a table of existing ores based on color and FX. If there is a conflicting ore (i.e. same color), replace the ore with dirt.