Addonpart issues

[CuriousMike56]

Most addonpart features (conflict checks, tweaking flexbodies/props, moving nodes, and wheel swaps) are no longer functional. Only loading additional meshes works OK.

Log gives "bad arguments" errors:

[RoR|Addonpart] WARNING: file 'Accord_Stanced.addonpart', directive 'addonpart_tweak_node': bad arguments
[RoR|Addonpart] WARNING: file 'BoxDodgeRam_Swamper.addonpart', directive 'addonpart_tweak_wheel': bad arguments
[RoR|Addonpart] WARNING: file 'BoxDodgeRam_Stacks_plain_2_L.addonpart', directive 'addonpart_tweak_flexbody': bad arguments
[RoR|Addonpart] WARNING: file 'BoxDodgeRam_Stacks_plain_2_L.addonpart', directive 'addonpart_unwanted_exhaust': bad arguments

Assuming this is caused by the newly introduced bundle syntax (#3171)