Add per-app requirements.txt files for pip install.

Author: mfitzp

browser/requirements.txt

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+PyQt5>=5.6

browser_tabbed/requirements.txt

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+PyQt5>=5.6

calculator/requirements.txt

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+PyQt5>=5.6

camera/requirements.txt

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+PyQt5>=5.6

currency/requirements.txt

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+PyQt5>=5.6
+requests>=2.0.0
+requests_cache>=0.4.13
+pyqtgraph>=0.10

mediaplayer/requirements.txt

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+PyQt5>=5.6

minesweeper/requirements.txt

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+PyQt5>=5.6

notepad/requirements.txt

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+PyQt5>=5.6

notes/requirements.txt

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+PyQt5>=5.6

paint/requirements.txt

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+PyQt5>=5.6