Use PascalCase for COM method names

Rename COM methods from camelCase to PascalCase to match standard COM
naming conventions. This improves consistency with existing COM APIs,
makes the code easier to follow, and clarifies that these methods are
COM-facing.

Change-Id: I7adbd3d7b71ee2c3489e06c64f30324a592509ca
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>