Added plugin to manage system clipboard

docs/source/platypush/plugins/clipboard.rst

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+``platypush.plugins.clipboard``
+===============================
+
+.. automodule:: platypush.plugins.clipboard
+    :members:
+

platypush/plugins/clipboard.py

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+import pyperclip
+
+from platypush.plugins import Plugin, action
+
+
+class ClipboardPlugin(Plugin):
+    """
+    Plugin to programmatically copy strings to your system clipboard
+    and get the current clipboard content.
+
+    Requires:
+        * **pyperclip** (``pip install pyperclip``)
+    """
+
+    @action
+    def copy(self, text):
+        """
+        Copies a text to the OS clipboard
+
+        :param text: Text to copy
+        :type text: str
+        """
+        pyperclip.copy(text)
+
+
+    @action
+    def paste(self):
+        """
+        Get the current content of the clipboard
+        """
+        return pyperclip.paste()
+
+
+# vim:sw=4:ts=4:et:
+