Added unit escorting formation!!! (#11057)

* Added escort button

* Added basic escort movement

* Improved escort movement

* Swapping breaks escorting

* Added stop escorting button

* Added link icon to unit

* getDistanceToTiles() now automatically includes escorting

* Multi-turn movement with different units works somewhat

* Escorting units persist to escort across saves

* Escorting units are only idle if their partner unit is idle as well

* Fixed multi-turn escort movement where one unit has more movement points left over

* Added basic tests

* Added a test for formation idle units

* Added some basic movement tests

* Added some canMoveTo tests

* getDistanceToTiles only caches when includeEscort is true

* added getDistanceToTiles test

* An entire commit to remove one line of white space just for you! And yes, there are no semi-colons;

* Added translations

* Added more stopEscorting() calls when the unit is removed

* Added extra comments and refactoring

* Refactored removeAllTilesNotInSet to use a mutableIterator

* Refactored code based on review

* Refactored removing tiles in PathsToTilesWithinTurn that aren't in another PathsToTilesWithinTurn

android/assets/jsons/translations/template.properties

@@ -1107,6 +1107,8 @@ Sleep =
 Sleep until healed = 
 Moving = 
 Set up = 
+Escort formation = 
+Stop Escort formation = 
 Paradrop = 
 Air Sweep = 
 Add in capital =