developer_diffuse: replace developer_float_diffuse, diffuse vectors too

Rebuilt internals. The float node's Distance method read and wrote a
stray sub_val attribute instead of the working value, so it never changed
anything; Connectivity was unfinished and the Vector branch was an older
float implementation reading parms that no longer existed.

One wrangle per method now works on the named attribute directly and
picks float or vector from attribsize(), so no Type parm is needed. The
update rules are the original ones applied per component for vectors,
minus the 0..1 clamp. Rate and Gain are shared by Distance and
Connectivity; Global keeps its own Goal and Gain. The unconditional
Normal SOP is gone.

Also moves developer_attribute_initialize's tab entry from
Developer/Float to Developer/Attribute.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

 ...galante.developer_attribute_initialize.1.0.hdalc | Bin 12641 -> 12645 bytes
 otls/sop_lsgalante.developer_diffuse.1.0.hdalc      | Bin 0 -> 9428 bytes
 .../sop_lsgalante.developer_float_diffuse.1.1.hdalc | Bin 13702 -> 0 bytes
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