use the dedicated xycenter property
avoid setting the previous end-interpolation values before starting the new one, to avoid a jump if the player advances too quickly (also shortens the code)
add subpixel True, even though it doesn't seem very effective
prepare improvement in next renpy version
* Converted Luna personal favours into the new system, and cleaned up the code.
* Added 'noncompliant' return result to differentiate between unmet event requirements and the disabled states
* Added disabled state default parameter
* Improved and posed "Give me a handy".
* Posed "Dance for me".
* Adjusted some of Hermione's nickname requirements to align with her attitude.
* Minor writing improvements.
* Fixed CGController incompatibility with Ren'py automatic image definition system causing issues with Cho handjob/blowjob CG scenes
* Converted introductory CGs into show statements
* Converted quidditch CGs into show statements
* Converted potions CGs into show statements
* Reviewed and removed redundant CG code
* Fixed miss-named Cho "crooked_smile" expression.
* Fixed Tonks' "Morph" effect being delayed in some instances.
* Fixed some calls showing multiple ">".
* Removed bld and blktone in some places where it's replaced by inner thought and narrator character.
* Minor writing fixes.
* Minor character positioning fixes.
* Added wet pussy and squirting when Tonks is masturbating, morphed as Hermione.
* Added Cho nose and cheeks freckles.
* Added redrawn versions of old cho clothing:
* top_tanktop_1
* top_tanktop_2
* witch (hat)
* Re-Added Hermione freckles to work better with multi-layer toggles.
* Re-Posed Hermione masturbation events.
* Re-Posed Luna masturbation events.
* Renamed some clothing folders for consistency.
* Fixed Cho Virgin-killer skin layer outline overlaps.
* Fixed Miss-labeled expression folders and names.
* Fixed folder structure on Hermione Masturbating pose folders.
