AP_Common: Location: allow retrieval of Vector3p from vector-from-origin

[peterbarker]

Extracted from #27250

This allows a vehicle using double-precision position offsets to get that increased precision object from a Location.

I've used a template here as the maths is identical, just the types different. Since we don't instantiate the second type at the moment there's no flash cost.

This is also built on top of #27253 which fixes the methods up a bit.

Board                    AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
CubeOrange-periph-heavy  *                                                                     
Durandal                            0      *           0       0                 0      0      0
Hitec-Airspeed           *                                                                     
KakuteH7-bdshot                     0      *           0       0                 0      0      0
MatekF405                           0      *           0       0                 0      0      0
Pixhawk1-1M-bdshot                  0                  0       0                 0      0      0
f103-QiotekPeriph        *                                                                     
f303-Universal           *                                                                     
iomcu                                                                *                         
revo-mini                           0      *           0       0                 0      0      0
skyviper-v2450                                         0                                       

This work sponsored by Freespace Operations

[IamPete1]

Looks good.