Support loading of environment constants from initial states file about flamegpu HOT 6 CLOSED

If not fixed via rapidxml branch, must be manually added to io.xslt

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Additionally, if the rapidXML branch is not adopted for agent state output, then types other than float, int and double will need incorporating into the output (and input), i.e. unsigned int which currently raises a warning.

(This will become a new issue)

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Additionally, environmental variables are allowed <defaultValue> in the schema and is shown in the examples, however this value is not used.
This should be relatively simple to fix, however loading from the initial states file also still required.

<gpu:constants>
    <gpu:variable>
        <type>int</type>
        <name>const_variable</name>
        <description>none</description>
        <defaultValue>1</defaultValue>
    </gpu:variable>
    <gpu:variable>
        <type>int</type>
        <name>const_array_variable</name>
        <description>none</description>
        <arrayLength>5</arrayLength>
    </gpu:variable>
</gpu:constants>

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Above commit has now been merged into rc1.5. Paul apparently said he'll handle env loading from init xml.

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Other types moved to new issue

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Done. FLAME GPU docs also updated on sharelatex.

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