* NEW CONFIG VALUES: ```DMS_MarkerPosRandomization```,
```DMS_MarkerPosRandomRadius```, and ```DMS_RandomMarkerBrush```
* With the above configs, you can randomize the marker positions in a
random position around the actual mission center.
* You can also "force" DMS_fnc_CreateMarker to randomize (or not
randomize) the marker position with optional boolean parameter of index
3.
* Changed the default (non-randomized) circle marker "brush". It should
be a solid circle.
* Created new functions ```DMS_fnc_SelectOffsetPos``` and
```DMS_fnc_SelectRandomVal```
* Adjusted a couple functions to use them.
* Fixed ```DMS_fnc_IsNearWater```.
