Bug 479450 - Set project encoding when creating a new project

This change automatically writes project encoding property on opening
just created projects to the project local settings, if that property
doesn't exist yet.

Change-Id: I63a12a16c563154f12bba4e17e6be39a755674f2
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.resources/+/96963