NOTE: Please update your .u2s files through VSS + TriggerUpdateMapData.

If a script (.u2s file) isn't found in the map-specific directory (from the
level's MapName, defaults to Test if not set), it can also be located in the
root script directory (normally Scripts). These "shared" scripts shouldn't
contain anything that is specific to particular levels, such as specific
gotoactors or targets etc.

Note that currently it isn't possible to "call" a script then return to a
previous script, so currently shared scripts are mainly limited to test
scripts, although its may also be useful to set up "termination" scripts
which contain sets of commands which are commonly performed when ending a
script or setting it up an NPC to respond to specific situations.