Small Refactoring of Plugin#30

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exside wants to merge 11 commits intororyg:masterfrom

exside:refactor-plugin

Commits on Sep 13, 2014

Add package config params and element helper description + events for the plugin
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Clean up cache options configuration
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Improve fallback for elementhelper.usergroups system setting by setting Administrator user group by default
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Improve class/service loading and error message on failure
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Change plugin workflow for system events to switch statement, better code readability like that + catching wrong system events
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Prepare for improved cache handling when the cache is cleared manually (OnSiteRefresh event)
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Add plugin to OnSiteRefresh system event in build script
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Update changelog
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Fix bugs introduced with changes
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Small changes to the Timing debug message and handling
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Correct console log message on manual cache clearing
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