Updated level editor [v1.7.8]

V1.7.8

Fixes:

• Improved selection visuals for the drag+select tool in the level editor
• Improved GUI feedback for the drag+select tool in the level editor.
• Fixed a bug where author name would disappear in the Level Editor - Options menu after editing the level name.
• Fixed minor spelling errors

Additions:

• Added level validation for the level editor after a successful playtest of a custom level.