Added how links should work
Added link basic type
'element' script command creates element only the first time
LINKS AWEMOST THERE

Yeah, I know I spelled it wrong
LINKS FULLY OPERATIONAL
Changed way the property 'useskeyboard' checks key events
Now use: link { receivefrom=..., applyto=..., with=...}
Changed 'link' to 'apply' in scene script
Apply formula sees properties attributes
Changed some terms
More terminology adaptation
Link share complete
Links are tables now.

Which means you can retrieve their original information
Merge branch 'link' into dev