Enhancement - ResourceHandler Encoding

[amaitland]

Add ability to specify encoding and include a preamble with using the ResourceHandler.

Resolves issue #689

[jankurianski]

Preable -> Preamble

[jankurianski]

I tested it out, works perfect 👍

[amaitland]

Fixed the spelling mistakes, thanks 👍

[amaitland]

I had a quick look to see if there was a more elegant way to write the Preamble. Haven't found anything yet. So we'll just go with this for now, it seems to work, and should be fairly efficient.

[jankurianski]

There is a "nicer looking" alternative that uses StreamWriter to write the encoding, but it is just as efficient as what you've got.

However, I think this will save the internal byte array of MemoryStream from being expanded unnecessarily:

var memoryStream = new MemoryStream(preamble.Length + bytes.Length);

[amaitland]

Nice finishing touch 👍 Thanks 😄

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