More class skeletons and minor fixes [ci skip]
Read-Only promotion for single property assigments [ci skip]
Read-Only promotion for single property assigments (2) [ci skip]
Type-hint use a read-only value [ci skip]
Read-Only promotion for single array-access assigments [ci skip]
Fix return of non memory tracked variables [ci skip]
check [ci skip]
remove obsvar [ci skip]
return_value must not be used to return references [ci skip]
memory manager must not be created when returning references [ci skip]