Missing valueContent + decoding for Markdown in decodeValueContent seems incorrect.

[CJ42]

I'm submitting a...

• bug report
• feature request
• question about the decisions made in the repository
• question about how to use this project

Summary

Should add support to decode value content as Bytes and BitArray.

Also, the value content Markdown is treated the same way as String, which seems incorrect.

erc725.js/src/lib/encoder.ts

Lines 750 to 763 in 58575e9

	case 'String': {
	return {
	type: 'string',
	encode: (value: string) => utf8ToHex(value),
	decode: (value: string) => hexToUtf8(value),
	};
	}
	case 'Markdown': {
	return {
	type: 'string',
	encode: (value: string) => utf8ToHex(value),
	decode: (value: string) => hexToUtf8(value),
	};
	}

Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)