List of module to process according to run_phases

This allow some new modules to be found and added while analysing the code.

Property definitions

nitc :: phase $ ToolContext :: _todo_nmodules
	# List of module to process according to `run_phases`
	#
	# This allow some new modules to be found and added while analysing the code.
	var todo_nmodules: Sequence[AModule]
src/phase.nit:89,2--92,37