Generate struct tags for golang downloads statistics

Feature:

Edit struct tags for golang.

Include:

• standard json tags • standard bson tags • standard both tags • camel json tags • camel bson tags • camel both tags • remove tags

Only need to click the menu once, instead of use autocomplete many times to write every tag.

Usage:

Select the codes need to convert(need to include the whole struct type, only select the fields won't work)

Then click the Tags menu (the last one in the main menu).