Add file/directory management

tests/manual/src/f1.txt

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+Simple text file with a %variable%
+
+twice: %another_variable%

tests/manual/src/f2.sh

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+#!/usr/bin/env bash
+# This file should be executable.
+echo "Hello, world!"

tests/manual/src/srcdir/1

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+1
+1
+1

tests/manual/src/srcdir/2

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+2
+2
+2

tests/manual/src/srcdir/sub/s1

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+s1
+s1
+s1

tests/manual/src/srcdir/sub/s2

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+s2
+s2
+s2