add vcsl sample library

[felixroos]

adds https://github.com/sgossner/VCSL as samples in prebake. following sounds are in it:

ballwhistle, bassdrum1, bassdrum2, bongo, conga, darbuka, framedrum, snare_modern, snare_hi, snare_low, snare_rim, timpani, timpani_roll, timpani2, tom_mallet, tom_stick, tom_rim, tom2_mallet, tom2_stick, tom2_rim, recorder_alto_stacc, recorder_alto_vib, recorder_alto_sus, recorder_bass_stacc, recorder_bass_vib, recorder_bass_sus, recorder_soprano_stacc, recorder_soprano_sus, recorder_tenor_stacc, recorder_tenor_vib, recorder_tenor_sus, ocarina_small_stacc, ocarina_small, ocarina, ocarina_vib, pipeorgan_loud_pedal, pipeorgan_loud, pipeorgan_quiet_pedal, pipeorgan_quiet, organ_4inch, organ_8inch, organ_full, trainwhistle, harmonica, harmonica_soft, harmonica_vib, super64, super64_acc, super64_vib, siren, didgeridoo, saxello, saxello_stacc, saxello_vib, sax, sax_stacc, sax_vib, harp, folkharp, strumstick, dantranh, dantranh_tremolo, dantranh_vibrato, kawai, steinway, psaltery_pluck, psaltery_spiccato, psaltery_bow, clavisynth, fmpiano, piano1, wineglass, wineglass_slow, agogo, anvil, brakedrum, balafon_hard, balafon_soft, balafon, belltree, cabasa, cajon, clap, clash, clash2, clave, cowbell, fingercymbal, flexatone, gong, gong2, guiro, glockenspiel, handbells, handchimes, hihat, kalimba, kalimba2, kalimba3, kalimba4, kalimba5, marimba, marktrees, oceandrum, ratchet, shaker_large, shaker_small, slapstick, sleighbells, slitdrum, sus_cymbal, sus_cymbal2, tambourine, tambourine2, triangle, tubularbells, tubularbells2, vibraphone, vibraphone_soft, vibraphone_bowed, vibraslap, woodblock, xylophone_hard_pp, xylophone_hard_ff, xylophone_medium_ff, xylophone_medium_pp, xylophone_soft_pp, xylophone_soft_ff