Calling xml converter

[klingbolt]

Addressing #80

This PR allows the user to select an xml pack and load the markers into the internal format.

At this state, only one pack can be loaded at a time.

[AsherGlick]

Code seems to crash on-load in the mistlock with the error

Is this caused by the same bug you mentioned was pre-existing? If so we can punt that fix to the next pr.

[klingbolt]

Code seems to crash on-load in the mistlock with the error

Is this caused by the same bug you mentioned was pre-existing? If so we can punt that fix to the next pr.

No this looks like something else. Is the file being loaded newly created or an older export? It seems to suggest there is a trail field in the proto with no points.

[AsherGlick]

I was able to trigger it to crash on startup when I had no converted markers, but I was also able to convert markers by not launching gw2 and using the burrito menus to convert markers. I converted the turtlepoint-skipbad markers and had the same issue.

I did have other old markers in the same burrito config directory but in a different subfolder. I attempted to remove them and was met with the same issue.

If there are no markers for a given map we probably should not crash, if that bug was introduced in this PR it should be fixed.

[AsherGlick]

After discussing offline, we will ignore this mistlock issue as it is just bad data. We should not crash on bad data thoguh. However it seems that all marker packs cannot be imported.