Merge branch 'Mario/showspecs' into 'master'

Merge branch Mario/showspecs (M merge request)

Shows who's spectating you (disabled by default).

See merge request !340

diff --cc defaultXonotic.cfg
Simple merge

diff --cc qcsrc/client/hud/panel/infomessages.qc
Simple merge

diff --cc qcsrc/client/main.qc
Simple merge

diff --cc qcsrc/client/main.qh
Simple merge

diff --cc qcsrc/server/autocvars.qh
Simple merge

diff --cc qcsrc/server/cl_client.qc
Simple merge