Results 7 issues of Andrei

On activate it might be useful to `cd` to `$GOPATH/src/` folder and switch back on deactivation. It will make it possible to use for example `dep` tool.

It could be useful to have hex validations on color inputs.

**Subsystem** Client common engine **Motivation** I've had an issue sending HTTP request with form data. A server was rejecting the request based on content-type. It was expecting `application/x-www-form-urlencoded` but [FormDataContent](https://github.com/ktorio/ktor/blob/80b68afb5a5133e1909299fc4d1bf81645dd3bd4/ktor-client/ktor-client-core/common/src/io/ktor/client/request/forms/FormDataContent.kt#L30)...