fix: Remove backticks from reserved words before adding an identifier suffix

[jbelkins]

Issue #

awslabs/aws-sdk-swift#1047

Description of changes

The newly-added AWSVerifiedPermissions service includes a structure with a property named set. Since set is a Swift reserved word, our symbol generator wraps the name in backticks for use in generated Swift code.

In the section that creates encoders/decoder methods, our code-generation tries to name a local variable by simply appending Container to the property name. If the backticks aren't removed before appending, this causes a compile error because `set`Container is not a valid Swift identifier.

To remedy, the places where an identifier is created from a property name have been modified to remove surrounding backticks first.

(also: Update dokka to 1.4.30, previous version 1.4.20 does not seem to resolve)

Scope

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.