Add the exported data to the CSV file

[David0817]

fix #416

[fullcircle23]

Good start. CSV download works.

But data in CSV download is not well formatted:

type	networkType	version	deadline	maxFee	signature	signer	transactionInfo	innerTransactions	cosignatures	recipientAddress	mosaics	message
16724	152	1	{"value":"2020-06-08T12:46:44.119"}	{"lower":1000000,"higher":0}	2AC26975709C8072650BFBF4F21A483EB22B38E1957F4AAD92FF83638733C8390A48C89C85F7A5CB3B7F5021721E85D632AD84C6B66DD37CB9FA3E9EF53B1403	{"publicKey":"9544226AD1FCD53570E5314B3BB1CB8A555ACA0054BCAFBA46F75719874AE249","address":{"address":"TA6W432Q3NHNQ5HQSKQ52XL7MFJZQITJRYBILQGG","networkType":152}}	{"height":{"lower":84689,"higher":0},"index":0,"id":"5EDDC197A7DED64D90A473C6","hash":"F9185D0F512E42A250B3451847B310A0FE5D5135B925C685F7E7F32F84CEF572","merkleComponentHash":"F9185D0F512E42A250B3451847B310A0FE5D5135B925C685F7E7F32F84CEF572"}			{"address":"TBOVIHJQKMX4LB7KF5AAD6TMNSTMVSNW5JUXM6QH","networkType":152}	[{"id":{"id":{"lower":3821645258,"higher":97953805}},"amount":{"lower":3205032704,"higher":1}}]	{"type":0,"payload":""}

The fields, field names and data should be similar to what user sees in transaction details. The data should be in plain text, not JSON format.

For example:
Type should be Transfer not 16724.
Network Type should be TEST_NET not 152.
Amount should be the actual amount like 7500, not like {"lower":3205032704,"higher":1}.
Similarly for MosaicId, NamespaceId, and other numeric values must be as a single value, not in lower and higher format.

@David0817 @evias

[fullcircle23]

Also, the style, microcopy, and position of the Download button need to be revisited separately. This applies to the Harvesting Show wizard button and potentially other components as well to achieve a clean, consistent and aesthetically pleasing design.