0004991: Add material dependent climb_slide sounds
Description
0004948 added sliding down climbables and the option to play material dependent slide sounds. Currently, tdm_player_thief.def only has one general sound definition due to the lack of appropriate sounds:
snd_climb_slide_default
Material dependent sound definitions can be ended in the same manner as the snd_climb_vert or snd_climb_horiz sounds, e.g.:
snd_climb_slide_metal
snd_climb_slide_foliage
