allow exports function to use single varibles

[titushm]

like this

[RJ-Infinity]

i think that having a function that is somthing like exportUnique would be better as then you can use both systems

[titushm]

maybe singleExport would be better

[RJ-Infinity]

so that you can either export an object and have it merged with all the others or just export a single object which could only be called once per class

[RJ-Infinity]

maybe singleExport would be better

this dosent emphasise the fact that it can only be called once per module though

[titushm]

singleCanOnlyBeCalledOncePerModuleExport

[RJ-Infinity]

it can only be called once beacuse in the old system if you did

exports({
    ParseContent,
    resolveMentions,
    resolveChannelMentions,
});
exports({
    resolveRoleMentions,
    resolveRelativeTime,
    Sanitise
});

all the objects would be exported however with the new system as a single object is being exported it couldnt support two calls as then you would have to remove the previous export so it wwould be better if this creates an error

[titushm]

nice formatting

[RJ-Infinity]

i think exportSingle is better than singleExport as it fits in with exportAs better

[titushm]

Fixed in #6