New features : precise multifile compilation and output directory

[Fugius]

Added 2 features : An option to choose the output directory (the directory where the executable is generated) and a check button in the options to read the file "compilerInfos" in the project root, this file should have this structure:

files:
  example1.cpp (<- no matter if it is tabulation or spaces)
  example2.c
  ...

this allow user for one project in particular to add some sources he wants to the project and to chose the output directory making the management of "bigger" c/c++ projects easier.

Everything is commented in the code.