cta-observatory/ctapipe: v0.19.3

Summary This is a bugfix release, find the list of merged pull requests below, the changelog is available on readthedocs. Contributors @LukasBeiske, @clara-escanuela, @kosack and @maxnoe What has changed since v0.19.2 Pull-requests containing changes of multiple nature are repeated. Render changelog for 0.19.3 (#2362) @maxnoe Improve docstring and validation of parameters in CameraGeometry (#2361) @maxnoe Fix removal of telescope events in software trigger, fixes #2356 (#2357) @maxnoe Add support for using toymodel in telescope frame (#2349) @maxnoe Fix pixel picking for multiple displays in same figure (#2358) @maxnoe Fill reference_location into SubarrayDescription.tel_coords (#2354) @maxnoe fix help string in disp reconstructor (#2352) @maxnoe Add support for hillas parameters in TelescopeFrame to CameraDisplay (#2347) @maxnoe Fix typo in merge tool flag definition (#2341) @LukasBeiske Fix return value of NullDataVolumeReducer (#2340) @maxnoe Peak time units conversion for the FlashCam reconstructor (#2337) @clara-escanuela Maintenance Improve error messages of expression engine (#2350) @maxno