Deprecated package

[Ibrahim-Halil-Kuray]

Subject of the issue

io/ioutil package is deprecated and used in the following list of files.

I am writing all the files in detail because it may give an idea about some other problems.

deprecated

• externalnode>external_node.go
• main>app>document.go
• main>app>external_node.go
• main>handlers>blockchain>airdrop.go
• main>handlers>formbilder>test_handlers.go
• main>handlers>helpers>helpers.go
• main>handlers>i18n>handlers.go
• main>handlers>template_ide.go
• main>priceservice>service.go
• main>www>embed_test.go
• service>form.go
• storage>database>files.go
• storage>json.go

[loleg]

Official docs suggest:

Deprecated: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.

We should look at this in #216 as many of those files are web components.