Various bug fixes

Various bug fixes

Various bug fixes and performance improvements

Fix: National flags not displaying some-times.
Fix: Update the display of the campaign names in the completed campaigns window.
Fix: Some sound effects not playing following the last update.
Remove: References to Persian cavalry with spears.

Add: Support for the Metal graphics system on all Apple devices, improving graphics performance.
Change: Campaign map graphics. It is now clearer which campaigns have been selected and completed.
Change: Improved A.I. opponent.
Change: Improved game logic for advance after combat. Unit will more often advance after combat if the target hex has been vacated.
Fix: An issue with the image scaling of SD images.
Fix: Some screen layout issues.

Fix: Some projectile animations were not displayed.

Change: Improved A.I. opponent.
Update: 'About Game' window.
Fix: Invalid font selection on some buttons on some platforms.

Improved: The AI has received some updates.
Change: Some UI updates.

Fix: A rare crash which could occur after charging.
Fix: A text error in the campaign lite window.
Fix: The information for Agnostic Campaign on the map select screen will now show.
Add: Next unit and previous unit buttons in the unit information window.

Fix: Units may sometimes have been unable to attack adjacent enemy huts or tents unless charging.
Change: When a general ends alone in a hex adjacent to an enemy, after enemy shooting, it now evades if possible, or is destroyed.
Fix: Some units were not getting their shock combat bonus in a charge combat.
Fix: Some time flank attacks provided no benefit in combat.

Fix: Some line of sight issues from high hill hexes across lower hill hexes.

Fix: A rare issue with the set side command on some missions.

Fix: Minor Ui issue affecting iPhone XR.

Change: Updated some unit values.
Fix: A bug with selecting the range button when your unit was not in range of another unit has been fixed.
Fix: A major update to the game AI.  Ranged units that were far from enemy units are now more responsive.
Fix: Updated how generals in chariots and on elephants are handled by the engine.
Fix: Light Infantry can once again move through other units and other units can move through light infantry.
Fix: When a unit kills an apposing unit in melee combat it will once again advance into the defeated units hex.

Fix: Some issues locking/unlocking some In-App purchases.

Fix: An issue with the scenario Sparks of War in the Agnostos Thule Campaign finishing early.

Fix: Improved memory management.
Fix: Improved hex tile Positioning accuracy.

Fix: Could crash while loading on iPhone Xr.
Change: iPhone and iPad: Major improvement to the map zoom feature (use two finger pinch to zoom in/out).
Changed: iPhone and iPad: The game is now optimised to used all the available screen space at the best screen resolution for each device.
- One some newer devices the game image was stretched.
- On some newer devices the game had a black border.
Change: Game performance is much faster and graphical execution smoother.
Add: The ability to unlock all scenarios in the settings menu.
Add: A whole new way to play, 'Historical Mode'. This is now an option on starting a new mission.
Add: Change log for all updates in the latest edition of the game.
Add: Change log to the help menu.
Add: A Change speed option in settings. This has three options standard, slow and fast which effects how fast the game plays.