openMPT ITI instrument pack update (Patreon)

an update to the ITI instrument collection for openmpt/impulse tracker users. lots of new stuff added (k1 [kawai k1], tia [atari 2600], and vir [access virus c] folders are all new). i've begun the long process of retuning and optimizing nearly every included instrument, though there's still a lot to do in that regard.

it's nearly 1000 files at this point, and i'll probably release it publicly once it breaks 1000 and i finish retuning/optimizing everything. according to the folder properties, i've been working on this since may 2021 now lmao. 

have fun as always and don't distribute the pack yet.