adds new SpellTES5exportedMAXmesh/"modify_tes5exportedMAXmesh" spell

Modifies some NiTriShape values to make the body mesh compatible with Skyrim. Use on body/armor meshes exported from MAX with NIF exporter. You need to run dump_BSLSP spell on a NIF with correct BSLightningShaderProperty first. Requires filename of the XML file from dump_BSLSP spell to be passed as argument.