Updated ptpov_/w_ models with skinfamillies, and rpak materials to pb…

…r +skin31 support

- Both ptpov and w_ models now have proper skinfamillies resembling average r2 weapon setup (default/skin31/prime 0-6)
- Replaced missing audio events with already existing sounds:

//	open
//	{ event AE_CL_PLAYSOUND 4 "SG_Twin_B.Reload_Open" }
//
// 	{ event AE_CL_PLAYSOUND 3 "wpn_softball_reload_start_mech_fr05_1p" }
//
//	eject
//	{ event AE_CL_PLAYSOUND 8 "SG_Twin_B.Reload_Eject" }
//
// 	{ event AE_CL_PLAYSOUND 0 "Weapon_Sidewinder_Reload_1_1P" }
//
//	load shell
//	{ event AE_CL_PLAYSOUND 20 "SG_Twin_B.Reload_InsertMag" }
//
//	{ event AE_CL_PLAYSOUND 8 "Weapon_Mastiff_Reload_LoadShell" }
//
//	close
//	{ event AE_CL_PLAYSOUND 19 "SG_Twin_B.Reload_Close" }
//
//	{ event AE_CL_PLAYSOUND 28 "Weapon_RE45_Reload_MagInsert" }
//
//	draw
//	{ event AE_CL_PLAYSOUND 0 "SG_twinB.Draw" }
//
//	{ event AE_CL_PLAYSOUND 0 "Weapon_R101_Equip" }
//
//	holster
//	{ event AE_CL_PLAYSOUND 0 "SG_twinB.Holster" }
//
//	{ event AE_CL_PLAYSOUND 0 "Weapon_R101_UnEquip" }
//

- removed references textures and models referencing weapons which were used as base for tb.
- rpak is now only 1024x for tb, shell is 512x.
- rpak now contains newly created skin31 material + dummy materials for prime skins 1-6 to prevent missing texture issues