Support adding files to an IDEA project from flexConvention.air.fileOptions

With this commit included files in AIR builds that were added via fileOptions are parsed into IDEA.

For example:
```
air {
    fileOptions = [
        CompilerOption.CHANGE_DIRECTORY.optionName,'media',
        'Default@2x.png',
        'Default-568h@2x.png',
        ....
    ]
}
```
is parsed into IDEA's `Files and folders to package` list in the Android & iOS tabs in the build configuration.