apply constraints to names for tasks and task instances in resource configuration

The same rules as for IEC identifiers are applied.
- no non-lating characters, ...
- no IEC keywords
- check for duplicate names in resource configuration

closes #19

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int CheckRetainBuffer(void)

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{

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	return 1;

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}

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void ValidateRetainBuffer(void)

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{

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}

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void InValidateRetainBuffer(void)

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{

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}

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void Retain(unsigned int offset, unsigned int count, void *p)

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{

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}

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void Remind(unsigned int offset, unsigned int count, void *p)

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{

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}