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Set <code>option</code> to <code>value</code>. 
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The handling of each option depends on the OptionHandler instance. Some options may become active immediately whereas other may be activated only when <a class="el" href="classlog4cxx_1_1_pattern_layout.html#f1f3ced78d335ec9c2b800d6d5aa3ef8">activateOptions</a> is called. 
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Implements <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html#8f2a