fix: don't show image preview on node its buggy
add: initial id pointer propertry support
fix: use fake user by now
fix: idref removed
fix: don't change sample type
fix: projection export resolved
fix: small fix
fix: tm export from object
Merge branch 'dev/datablock_pointer'

Use PointerProperty from custom build to assign node trees.
fix: better defaults; better names
fix: pynodes_framework removed
fix: pynodes_framework removed
fix: simplified
fix: better defaults
fix: missing control
fix: pynodes_framework removed
add: initial node category support
add: some layout nodes
fix: node category support; leads to search support
add: node category support