BS-2672
BBPMC-100
Do not use convertToId on widget name but toJavaIdentifier instead

Conflicts:
	bundles/plugins/org.bonitasoft.studio.common/src/org/bonitasoft/studio/common/NamingUtils.java
	bundles/plugins/org.bonitasoft.studio.diagram.form.custom/src/org/bonitasoft/studio/diagram/form/custom/commands/CreateFormCommand.java