Christopher Phillips

Test that env increases by one when gate is set iff rc matches limit, for adsr=ff00

added test for SID envelope exponential counter reset

added note that new sha tests pass on C64(old)

Added timing and page crossing tests for sha abs,y and sha (zp),y

documented the timing for &(h+1) drop off for SHX and SHY, added testcode for said timing relative to sprite and character DMA in the presence of page crossing, corrected documentation on address calculation

Additional tests for SHS/TAS, checking page crossing, timing of masking dropping relative to cycle stealing, and interaction with character DMA. Also corrected documentation on address calculation when page index is crossed.

For gtk3/macOS, placing vice_datadir under user_config_path for now

Drive motor speed settings for OS X port