fix(developer): box package compiler info fields

[mcdurdin]

If a .kps file had an <Info> element without a URL attribute, it would not map correctly in all circumstances. This change ensures that the kps-file-reader is responsible for normalizing the layout of these elements on read. This simplifies usage of the info elements.

@keymanapp-test-bot skip

[keymanapp-test-bot[bot]]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• Keyboards
  • Test Keyboards