Backport bug fixes and bump version to 4.5.3

Bug fixes included:
https://github.com/xtuple/xtuple/commit/26f8550562209b0a5aac5d3f3e851543848226a4
https://github.com/xtuple/xtuple/commit/9cdfa8dc91eeda6af715329bff7a880506e616d7

## private-extensions PR
https://github.com/xtuple/private-extensions/pull/463

## xtuple-extensions PR
https://github.com/xtuple/xtuple-extensions/pull/173

@shackbarth @gilmoskowitz @lynnaloo @tjwebb @xtpclark @jcarlin @garyhgohoos @gpazo @bixwilson 
Any other bug fixes we need to include in a 4.5.3 release?