Update VHHH (Hong Kong) ground layout and GRP configuration (#104)

* Update .sct and GRP maps with 3RS layout

* Add runway direction visual aids for 07C/25C

* Add default WAT holds

* Update 07C/25C coordinates

* Add mixed mode runway direction visual aids

* Implement very rudimentary ground splitting

* Fix ground CJS

* Add taxiway labels (rough)

* Revert GMC splits

* Add missing D10 taxiway label

---------

Co-authored-by: Justin Wai <justin.wai@gmail.com>