Added support for using file that specify paths to files to process

[oceanofthelost]

A new optional argument "i" was created and added to program. When this argument is used, the program will process the input file as if it contains a list of files to process.

For example, if ravioli run with the following command

ravioli -i in.txt

where the contents of ravioli is the following

in.txt
    ./test.c
    ./test2.c
    ../../test3.c

ravioli will read the contents of in.txt internally, then process the each file.

the "-i" command is similar to specifying a directory, bunt instead of having ravioli find each source file based on file extensions, the user specifies the files directly.

This option was added so that ravioli could be run as an automated step as a post build step.