Furnace v0.6pre4-hotfix (beta) - fix to critical initial system bug

this release fixes a critical bug in 0.6pre4 where the initial system would have near-zero volume after the intro plays for the first time.

the changes featured in 0.6pre4 are:

• new speed system - easier to use and now with groove patterns
• two new chips: SM8521 (used in Game.com) and Ensoniq ES5506 (32 sample channels)
• output patchbay which allows you to route chip outputs arbitrarily (useful for JACK)
• support for more than stereo (OPL3 and ES5506 are the supported chips)
• optimized SCC and VRC6 emulation
• true SegaPCM emulation
• a brand-new intro and welcome screen
• basic mode with reduced feature set for ease of use
• 1.1.7 .dmf support
• re-organized the UI a bit for ease of use
• a bunch of bug fixes

thanks to the people who found and reported this bug!

32-BIT WINDOWS NOTE

this release features a Windows XP-compatible 32-bit build.
in order to ensure that it will be compatible with XP, I had to disable Native File Dialog and use portable-file-dialogs instead.
because it has a hang issue, the system file picker is not on by default.

only use the 32-bit build if you are absolutely certain you need it. otherwise, you don't. get the 64-bit release instead!