* Reorganize MapEngine
This is already turning into a mess...
* Map engine selects tile index to use
Still very ugly
* Fix subtile flag combination
* Prepare randomly generated base tiles
* Restore collision viewer
* Movement works again, searches for straight paths
Paths are now d2vector slices
* Fix LOS calculation
* Fix test (I think)
* smooth camera with vectors
* add smooth cam support to map engine test
smooth cam now works in map engine test.
clicking or holding the left-mouse button will move the camera.
also works with freecam mode in single-player.
* Update ebiten_renderer.go
did not mean to edit this file
* moved filter constants back to d2enum
* moving key and mouse button enums into d2enum
* moving render type enum into d2enum
* moving input even priority enums into d2enum
* moving terminal enums into d2enum
* lint fixes for the game.go
* lint fixes for the gui_testing.go
* lint fixes for the blizzard_intro.go, map_engine_testing.go and select_hero_class.go
* added package comment for the d2gamescreen package
* fixes after merge
* more lint fixes for the d2core/d2term
* lint fixes for the escape_menu.go
* fixed lint issues of credits screen
* more lint fixes for the d2gamescreen
* lint fixes for the main menu of d2game/d2gamescreen package
* lint fixes for the main menu and map engine testing of d2game/d2gamescreen package
* more lint fixes for the main menu of d2game/d2gamescreen package
* lint fixes for the character select screen of d2game/d2gamescreen package