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This reverts commit c7a1e5cd.

This allows assigning property values even if the property type is
unknown, e.g. when iterating over mesh properties.

Motivation: avoid OpenFlipper crash when saving meshes with unsupported
properties.

This is useful for precondition checks in client code.

GeometryKernel::collect_garbage used to first perform the TopologyKernel
garbage collection, usually shrinking its vertex_deleted_ member, then
accessed it using is_deleted() with the old vertex indices.

This caused out-of-bounds memory access (made visible by
cmake -DSTL_VECTOR_CHECKS=ON) and non-fast deletion also resulted in wrong
results, the remaining vertices had wrong coordinates.