Level event handler

event handling in level changed significantly there is a commentary on how to operate the game in level.hpp

changed milestone to %Spezifikation des Bewegungssystems

added Needs Review label

added 3 commits

• c2808f8c - Fix crashing menu when selecting info and add more debug output
• b5ffe3d9 - Add check for unit moving onto a tile another unit is already stationed on
• 21e608fb - Add checks for attacking allies and debug output for clicking non valid target

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added 8 commits

• 21e608fb...8796f9b4 - 7 commits from branch main
• 8553275f - Merge branch 'main' into 'LevelEventHandler'

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mentioned in commit 639e4955

merged

mentioned in issue #27 (closed)