o.c.swt.widgets: Allow resources from web links with spaces

BOY Images (and *.opi files in general) didn't load if the URL contained
spaces. Need "%20" for that, but at the same time must keep the space
when loading the file locally from file system.
Merge remote-tracking branch 'origin/master' into sns
Merge remote-tracking branch 'origin/master' into sns

Conflicts:
	applications/plugins/org.csstudio.swt.widgets/src/org/csstudio/swt/widgets/util/ResourceUtil.java
o.c.archive.reader.rdb: Add preference for fetch_size

Original hard-coded value could result in out-of-memory error
Merge remote-tracking branch 'origin/master' into sns
o.c.opibuilder: Update online help example for `ColorFontUtil`
SNS: Version to 3.2.15
Merge remote-tracking branch 'origin/master' into sns
Merge pull request #410 from ControlSystemStudio/sns

Sns