Base: missing features

[wolfgangmm]

Things missing in base profile to restore previous functionality:

• build.xml not generated
• Download app as xar missing in administration menu
• .existdb.json for vscode integration
• package.json for build including a local copy of components

[DrRataplan]

The build.xml and .existdb.json are generated now, as part of #14. Feel free to over them and update them tot he latest standards ofc, I just took the bare minimum from other apps.

[duncdrum]

package.json gets generated @windauer good to close imv