Enable overloading of task triggerring source cell editor (SINGLE) in resource editor. PLCGenerator now generates MULTI keywork instead of SINGLE when task's activation is surroundes with square brackets

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                  <xsd:element name="Win32">

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                    <xsd:complexType>

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                      %(toolchain_gcc)s

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                    </xsd:complexType>

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                  </xsd:element>

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