[v0.2.0] Enable/disable plugins

Pipelight with multiplugin support (minimum version >= 0.2.0) allows you to enable/disable Silverlight (or any other plugin), such that for example each user can have its individual set of plugins.

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The following commands are useful to change the system-wide configuration (for all users).

# Help including a list of supported plugins
pipelight-plugin --help

# Shows a list of all enabled plugins
sudo pipelight-plugin --list-enabled

# Enable/Disable some plugins (just an example, should be self-explanatory)
sudo pipelight-plugin --disable silverlight5.1
sudo pipelight-plugin --enable silverlight5.0

# Disable all plugins
sudo pipelight-plugin --disable-all

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When you want to enable plugins individually for a specific user, just run instead (WITHOUT sudo!):

pipelight-plugin --list-enabled
pipelight-plugin --disable silverlight5.1
pipelight-plugin --enable silverlight5.0
...

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More examples and information about the specific plugins are available at http://fds-team.de/cms/pipelight-installation.html#section_2_1
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Please note: When multiple versions of the same plugin are enabled, the browser might choose the wrong version in some cases. At least in Chromium/Google-Chrome it is possible to disable these wrong versions in "about:plugins" -> "Details". All Pipelight related plugins have a filename like "libpipelight-*.so". For other browsers it might be necessary to remove the system-wide enabled plugins, and just enable them on a per-user-basis, such that only the required plugins are loaded.