New lua functions for cell markers

[softcoder]

- added lua functions to add / remove cell markers:
addCellMarker(0,'test from scenario!','',cellMarker)
param1=factionindex
param2=cell hint
param3=empty string
param4=cellPosition

removeCellMarker(0,{46,13})
param1=factionindex
param2=cellPosition

Through lua you may add 'system' markers that do not belong to any team. USe a faction index of -1 for those types of faction markers.

[Omega]

addCellMarker(0,'test from scenario!','',cellMarker)
param1=factionindex
param2=cell hint
param3=empty string
param4=cellPosition

What's the empty string (parameter 3) for?

[softcoder]

A placeholder for now (I may allow for a custom texture file to be used)

[ProfEclipse]

Be more detailed ? I don't know.