0.18.6

0.18.5 -> 0.18.6

Changes:

• When a unit is selected, pressing the right mouse button will deselect it.
• The music (if playing) will now pause when the browser tab in which the game is running isn't the currently selected one.

Bug Fixes:

• The Czech Hedgehog's tooltip no longer falsely states that it's single use.
• Restarting the game no longer automatically selects the rifleman unit.
• Tooltips no longer appear during the game over screen.
• Unused images will no longer load.