Upgrade to latest Selenium Foundation; improve access to browser-specific unit tests

In this release, I upgraded to the latest release of Selenium Foundation (version 30.0.2). This required updating the unit tests for Mac2, XCUITest, and Windows.

I upgraded several other dependencies as well.

I now use the standard getCurrentCapabilities() method to get the target browser capabilities. I also added settings.properties files for all subprojects. These updates provide much better control over local Grid configuration and target browser for the subproject unit tests.

I also took the time to add JavaDoc everywhere that the compiler complained about.