add %o and %O to chat formatting for own origin

%O is just for more decimals as an option if %o isn't accurate enough for some nerd stuff.

This makes coordinates more accessible and shareable compared to something like:

]prvm_globalget client csqcplayer
2800
]prvm_edictget client 2800 origin
123 456 789

]prvm_globalget client CSQCModel_players
2800
]prvm_edictget client 2800 origin
123 456 789

Which are insane to ask casual players to be able to use on their own without copypasting instructions from an expert.