Maintenance: Change unit test class names to CamelCase (#1288)

Maintenance: Change unit test class names to CamelCase (#1288)

Besides applying Project CamelCase class naming rules to all CppUnit
test class names, these script-driven changes also adjust affected class
name-dependent code, improve consistency across unit test declarations a
little, and rename a few test classes (e.g. testURL is not TestUri). The
corresponding source code filenames are left unchanged (for now).