AI prioritizes its path to buying highly desirable tiles

AI prioritizes work boats, and creates work boats for close non-contiguous cities

Workers try to build roads utilizing existing roads, and railroads overriding existing roads

UnitFilter also matches TechFilter for that unit

4.7.0-patch1

Revert "Make ExpanderTab "expand" properly "

By SomeTroglodyte:
- Improve Alert Popup scrolling 
- Make mod categories curated in Json 
- Scene2D debug tool 
- Fix vulnerability of new NationPickerPopup icon view 
- Long press support 
- Keyboard bindings - collision check