web 3.0.0 API

Adds utilities for serving HTML pages over HTTP servers. Includes kotlinx.html support.

=== "build.gradle"

```groovy
repositories {
    mavenCentral()
}

implementation("com.hexagonkt.extra:web:$hexagonVersion")
```

=== "pom.xml"

```xml
<dependency><groupId>com.hexagonkt.extra</groupId><artifactId>web</artifactId><version>$hexagonVersion</version></dependency>
```

Provide utilities for template processing inside HTTP handlers.