RFE: Support multi web apps

[vyazelenko]

Currently (as of 2.2.4) it is only possible to run a single web app. However there are use cases where multiple web apps should be deployed into Tomcat. It would be great if such a feature was supported by gradle-tomcat-plugin. This is similar to Multiple web-apps provided by https://github.com/akhikhl/gretty plugin.

I was thinking that this could be achieved by adding webapps configuration block, e.g.:

tomcat {
    httpPort = 8090
    httpsPort = 8091
    enableSSL = true

    webapps {
        webapp {
            reloadable=true
            contextPath= 'sample-app1'
            webDefaultXml=...
            additionalRuntimeResources=...
        }

        webapp {
            reloadable=false
            contextPath= 'sample-app2'
            webDefaultXml=...
            additionalRuntimeResources=...
        }
    }
}

Each webapp then will contain all web app specific configuration and tomcat will contain Tomcat configuration. For compatibility it is probably makes sense to still support old way of configuring single app as before.