Fixed hyperparameter conversion from XML for EAGLE

[TKlerx]

When running LIMES with an XML config and using the EAGLE algorithm, parsing of the hyperparameters fails because the hyperparameters are handed over as strings and cannot be casted directly into Float/Integer/Boolean. The toString() at the end is for making it compatible with setting the parameter directly via API.

Tested with Windows 10 (2004), Java 11 and the following config for EAGLE:

    <MLALGORITHM>
    <NAME>eagle</NAME>
    <TYPE>unsupervised</TYPE>
    <PARAMETER> 
        <NAME>generations</NAME>
        <VALUE>100</VALUE>
    </PARAMETER>
    <PARAMETER> 
        <NAME>population</NAME>
        <VALUE>100</VALUE>
    </PARAMETER>
    <PARAMETER> 
        <NAME>crossover_rate</NAME>
        <VALUE>0.3</VALUE>
    </PARAMETER>
    <PARAMETER> 
        <NAME>preserve_fittest</NAME>
        <VALUE>true</VALUE>
    </PARAMETER>
    </MLALGORITHM>

[kvndrsslr]

Thanks for your contribution. Merged in a separate commit.