Log Message:
pt2-clone: update to 1.45

- Added support for loading XPK-compressed MOD files

- Fixed (rarely audible) click bug in the BLEP synthesis code.
This bug was introduced in v1.34.

- Fixed: CTRL+T (Swap Channel) didn't refresh the pattern data view,
nor did it update the "song is modified" state

- Fix possible out-of-sync state between tracker and replayer if the
module was stopped during a position transition. The replayer is one
tick ahead, so this can very well happen (f.ex. during pattern loop,
pattern break, position jump, row 63->0 transition)

- Added a new config entry called "STEPPLAY_KEEP_EDITMODE", which allows
for step-play (return/backspace) to not leave edit mode after use