linter fixes

[alonbg]

1st commit - upgrade tooling + minor error fixes

2nd

• many small improvements (namely final where needed) & local refactoring
• lint baseline
• fix out-of-branch commit dff13145a5a630b474aea51da0a5774e7d5dab83

still hanging in there (baseline)

• usage of API from a higher version than declared
• locale issues (xml files)