like /tools/mspsim.
This is a very simple modification that affects a very large number of files in Contiki: Cooja,
/platform/cooja, Collect-view, Coffe-manager, and Cooja simulation files (.csc).
I've gone through Contiki to update all references I could find. Nevertheless, this commit will likely
break external dependencies, like saved Cooja simulation files.
Therefore I introduced the make variable CONTIKI_PROJECT. Now a typical project Makefile starts with:
CONTIKI_PROJECT = hello-world
all: $(CONTIKI_PROJECT)