Minifigcreator: maven build for products

New projects:
* org.eclipsescout.demo.minifigcreator.server.product
* org.eclipsescout.demo.minifigcreator.ui.swing.product
* org.eclipsescout.demo.minifigcreator.ui.swt.product
iBug: maven build

New projects:
* org.eclipsescout.demo.ibug.parent
* org.eclipsescout.demo.ibug.server.product
* org.eclipsescout.demo.ibug.ui.rap.product
* org.eclipsescout.demo.ibug.ui.swing.product
* org.eclipsescout.demo.ibug.ui.swt.product

add maven nature to all projects

update target platform