Merge branch 'DefaultUser/more_damagetext' into 'master'

Add more options for damagetext

{potential} describes the full damage the target took without capping it when the target dies
{potential_health} describes the health damage the target took without capping it when the target dies

See merge request !382

diff --cc defaultXonotic.cfg
Simple merge

diff --cc qcsrc/server/mutators/events.qh
Simple merge

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