[Cin] variable fast/slow playback speed hack

so i wondered if changing speed for fast/slow reverse and normal playback was possible.. after few hours of hacking I made this patch. it makes fast/slow playback speed configurable in Cinelerra_rc via new stored variables: ===j LOADPREVIOUS16 /data/data/com.termux/files/home/LibRaw/RAW_CANON_G1.CRW LOADPREVIOUS17 /data/data/com.termux/files/home/av1-cpu5-crf10.mkv SLOW_SPEED 5.000000e-01 FAST_SPEED 4.000000e+00 here I set fast playback speed to 4x, while slow_playback default remain at 0.5 .... no gui yet because I am still unsure about gui elements but I had idea about putting two input boxes in Preferences for this.. but I can be wrong with my hacking....