(Feature) Consider download contract info zip file from manage page

[fernandomg]

Closes #627

In this PR besides moving all the downloadCrowdsaleInfo to its own utility file, I took the opportunity to refactor it a bit so it's a bit easier to maintain/extend.

Also did the following fixes:

• For minted-capped strategy, if there was one tier with whitelist enabled, all tiers rendered the whitelist table header.
• For minted-capped strategy, minCap wasn't rendered in non-whitelisted tiers.
• For both strategies, global minCap is rendered only for dutch-auction strategy.
• Used box-drawing chars for the tables
• Made files more consistent in structure and spaces

[dennis00010011b]

@fernandomg Minted - Manage page: downloaded file MintedCappedCrowdsale_data.txt contains incorrect info:

1. Crowdsale end time
2. Crowdsale hard cap (last tier's hard cap instead total hard cap)

Also modifying of crowdsale's end time aren't reflected in file MintedCappedCrowdsale_data.txt

Paameters of crowdsale: minted , 2 tiers, start/end time by default, no whitelist

it is also actual for Dutch

[dennis00010011b]

@fernandomg Crowdsale parameters: Minted, 2 tiers, no whitelist, both tiers modifiable Steps:

1. Change moncap for tier #1
2. Download files and observe file 002_tier.txt Result : Min cap value in file 002_tier.txt changed after modifying mincap for tier #1

[dennis00010011b]

@fernandomg Whitelist's table is messed in file ###_tier.txt. It is actual for files downloaded from publish page too. There are symbol , instead \n

Device: MacBookPro, MacOS, High Sierra 10.13.6

[fernandomg]

@dennis00010011b,

• Crowdsale global values where fixed (total supply and end time)
• Whitelist table layout fixed
• For tier n>1, min cap is properly updated.
• And if the save button was enabled, clicking on Download triggers save action. That was fixed as well.

[dennis00010011b]

@fernandomg Auth-os_addresses.txt file : double lines for Auth-os SaleManager address, Auth-os TokenManager address

[dennis00010011b]

@fernandomg Should encoded ABI parameters be changed if crowdsale's start/end time was changed? They aren't updated in file

[fernandomg]

Should encoded ABI parameters be changed if crowdsale's start/end time was changed? They aren't updated in file

@dennis00010011b you can check, from the following block that the ABI params do not depend on those values: https://github.com/poanetwork/token-wizard/blob/2.0/src/components/stepFour/utils.js#L64-L76

[fernandomg]

Auth-os_addresses.txt file : double lines for Auth-os SaleManager address, Auth-os TokenManager address

Fixed. Thanks for that catch