set-version doesn't update launcher name in product file

[bllngr]

Steps to reproduce

• In a project, make sure the launcher name in the product file includes the project version, e.g. My Product 1.2.3
• Run mvn clean package and make sure the created launcher includes the version number, eg My Product 1.2.3.exe on Windows
• Run mvn org.eclipse.tycho:tycho-versions-plugin:set-version -DnewVersion=2.0.0
• Run mvn clean package and check the name of the created launcher

Expected result

The launcher name contains the new version. i.e. My Product 2.0.0.exe on Windows

Actual result

The version in the launcher name is not updated and stays on the old version, i.e. My Product 1.2.3.exe on Windows

Excerpts

<product name=My Product" uid="my-product" id="my.product" application="org.eclipse.e4.ui.workbench.swt.E4Application" 
   version="1.2.3" includeLaunchers="true">

   <!-- ... -->

   <launcher name="My Product 1.2.3">
   </launcher>

   <!-- ... -->

</product>

[laeubi]

I'm not sure this is something one can expect, how should Tycho know it is "the version" and not an arbitrary string?

[laeubi]

It might be more valuable to support property replacement in the launcher name so it can become:

<launcher name="My Product ${project.version}">

or

<launcher name="My Product ${product.version}">