Roll back v1.10.0 Gin changes

PR #530 was a breaking change I should not have merged.

Some new features and many bug fixes

Thank you everyone for your PR's. I'm incrementing the minor version because some new functionality was added:

• x-go-type (#517)
• UUID formatted strings (#546)
• readOnly/writeOnly properties (#547)

I've also merged numerous bug fixes.

Sorry for the long delay in releases, I've been extremely busy, and it takes time to go over PR's to make sure they don't break something.

Bug fixes, go embed for templates

• Update Echo to fix security issues and baseurl handling
• Internally, use go:embed instead of third party embedding tools for templates.

Gin support, auth example, bug fixes

We're increasing the minor version to 1.9.0 since there's new support for Gin and some new libraries in pkg/runtime.

Thanks for all the contributions.

Bug fixes

• Merged a number of PR's fixing various bugs in code generation. Thank you all.

Many bug fixes

I merged quite a few formatting and bug fixes, thanks everyone.

Revert a breaking change

• I reverted the fix for #380 because it changes behavior in a very fragile area. I will revisit this in the future. This fixes the build, for tooling that requires our tests to pass.

Add custom extra tags on Go fields

• Please see the README, but you can now specify additional Go field tags via the x-oapi-codegen-extra-tags extension property. I bumped minor version to 1.8.0 on account of this new functionality.
• Bug fixes merged, thanks for all the PR's

Minor updates and build fix

• v1.7.0 had failing unit tests, these are now fixed.
• The format for schemas of type number can now be any go type. This isn't spec compliant, but easier to work with

Add a version flag

The oapi-codegen command now accepts a --version command line option, which will use the debug.BuildInfo to print out the version of the oapi-codegen module which produced it.

The version number will look the same as what you'd see in your go.mod file when importing oapi-codegen.