text: Write xml:space as XML attribute in SVG output.Fix a crash when activating Color Index filter in the filter brush ( Bug 473242).

Fix crash when activating Halftone filter in Filter Brush ( Bug 473242).Here is the full list of bugs (and other minor changes) have been fixed since the second beta: autokeyframing feature of animated layers got a lot of fixes since Beta2.dockers layout should now be properly restored after Krita restart, even after the usage of canvas-only mode.assignment of profiles to displays in multi-monitor setup (Krita should use EDID info to map the displays to profiles everywhere, except on macOS).Please pay extra attention to the following features of Krita, since they got updated or reworked since Beta2: The release candidate is here for Krita 5.2, this means that we are confident that all the major bugs brought on by the changes in Krita 5.2 have now been fixed, and would like you to give it another round of testing.