* feat: conditionally install and build the 'login' and 'backoffice' targets depending on source files
* feat: remove the preconditions target, because we are now compiling a file list to check if we need to build
* feat: remove the 'clean' targets, because the project will be cleaned if any of the compiled file lists do not exist
* feat: remove the preserve.* files as they are no longer needed
* Enable default content items again
* Remove package.json from restore target inputs
* Include generated files as static assets after build
* Clean up project files
* Exclude CS0618 warning as error and fix CA2264
* Exclude CS0612 warning as error
* Suppress removal of test fixture
* Use separate property/item groups for backoffice and login project
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Co-authored-by: Ronald Barendse <ronald@barend.se>
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