[Feature] ca65 Integration

[nickkeane]

Would love to see integration of ca65 and ld65 as an additional alternative to dasm for assembly

[chunkypixel]

HI apologies for the delay in responding. Whilst adding additional language support would be viable the extension would become far too large (its right on the boundaries now). I really want to one day rework the entire extension and maybe that might provide some opportunites eventually.