command line tool should detect OF folder

[arturoc]

if you are somewhere inside an OF install, it's easy to go down the path until you reach an OF_ROOT or the absolute root of the file system. if the first happens then we should use that as the default OF_ROOT.

That would simplify the command line call without having to define environment variables and is safe to assume that if one is inside an OF install running the command line tool that's the OF install they want to use.

We could also do the same for the path of the project, if the cwd is outside of any OF install but the path to the new project is inside then we could safely assume that's the OF install the user wants to use too

[hiroMTB]

True, how can we detect oF root?
Like,

if
  there are oF folders like apps, addons, libs, scripts, etc
then 
  oF root

or

if 
  there is special hidden file (e.g. .openframeworksRoot) 
then
  oF root