Changes

NumberField: add lenient parsing

This implementation is a best effort approach for a more lenient parsing
of decimal/grouping separators for decimal inputs.
It is only used if the parsing by java's DecimalFormat.parse is not
successful. This is not a perfect solution since DecimalFormat parses
inputs that look wrong to the eye.

259328

Change-Id: I35ae05e5dc5b2470bd35e5fac962e92315a45ec7
Signed-off-by: Ralf Muri <ralf.muri@bsi-software.com>
Reviewed-on: https://git.eclipse.org/r/156071
Tested-by: CI Bot
Reviewed-by: Beat Schwarzentrub <bsh@bsiag.com>