Feature:
license tags should support the "file" attribute in format 3.
Background
A less prominent format 3 feature but important for legality, this feature allows directly referencing the added license file.
Details
[x] When auto-completing the license tag, just like with URLs, the "file" attribute should be suggested. Trying to complete the file in the argument should trigger a file lookup with a path relative to package.xml.
[x] Add a new inspection that goes through the value of the license tags and if they require a file (like Apache-2.0) and the format is 3 or higher, raise a warning that tells the user to add a LICENSE file and suggests a fix.
[x] when the format is lower than 3 and the attribute is used, add an inspection that suggests upgrading to format 3
more details on the new tag are available in REP 149
Feature: license tags should support the "file" attribute in format 3.
Background A less prominent format 3 feature but important for legality, this feature allows directly referencing the added license file.
Details
more details on the new tag are available in REP 149