Adds support of custom type parameters (#5)

[jgarec]

• Adds new parameters : sourcesCustomTypeMapping & testsCustomTypeMapping
• Adds one new sample project

[jgarec]

Here's an example of the new parameters :

        <sourcesCustomTypeMapping>
                <customTypeMapping>
                        <type>package body</type>
                        <customMapping>package_bodies</customMapping>
                </customTypeMapping>
        </sourcesCustomTypeMapping>

where sourcesCustomTypeMapping contains a list of customTypeMapping

[jgebal]

@alberto-hernandez , @pesse Are you OK with merging this PR?

[pesse]

Looks like great work. One thing about test showcase: wouldn't it be better/more consistent to integrate that into demo-project and link to that? I like the package pretty much and it would be a great benefit to have it available for several modules

[alberto-hernandez]

Great Work!