Coverity issues since 28.02.2022

• commit 1: add a virtual destructor and free the memory for ::Private for KoSvgPaste
• commit 2: fix issue with QDebug custom function returning a reference to an object created inside the function
• commit 3: free the memory before exiting the function that allocated it (since no one will have a pointer because it was an early exit caused by an error)
• commit 4: initialize the m_page variable to 0, and add a recoverable assert in case it won't be created in the constructor (without it, it was theoretically possible to write to memory that didn't belong to that part of code)
• commit 5: initialize values in class KisSprayOptionProperties already in class definition (Coverity doesn't see the implementation for readOptionSettingImpl() so it assumes the members to be not initialized - I marked it as False positives but I think initializing values is a good idea anyway so I added a fix too)
• commit 6: initialize values in class KisGridOpProperties already in class definition (like above)
• commit 7: initialize values in KisCurveOptionProperties (like above)
• commit 8: initialize values in KisDuplicateOp (like above)
• commit 9: change ::Private c-style pointer into a QScopedPointer in Recorder Export (both RecorderExport::Private itself and the UI class)
• commit 10: as above, but for RecorderDockerDock::Private
• commit 11: free memory of ColorConverter
• commit 12: initialize values in KisSizeBrushOption and DeformOption in /deform/ paintop (like above)

Stats

Commit no.	Issues count
1	1
2	1
3	1
4	1
5	8
6	6
7	6
8	3
9	1
10	1
11	1
12	2
Sum	32

Test Plan

• run all tests before and after the MR

Formalities Checklist

• I confirmed this builds.
• I confirmed Krita ran and the relevant functions work.
• I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
• I made sure my commits build individually and have good descriptions as per KDE guidelines.
• I made sure my code conforms to the standards set in the HACKING file.
• I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.