Add onGameTick20 to try and encourage lua to be a bit more efficient. Rewrite Space Invasion to use it. Top speed of aliens is 25% higher now, although that could be changed, I kinda liked it. Change parameter order of div().

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<?xml version="1.0" encoding="UTF-8"?>

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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

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<plist version="1.0">

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<dict>

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	<key>get-task-allow</key>

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	<true/>

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</dict>

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</plist>