usbmc

• Added support for 3.65/3.67 (thanks The_FloW)
• Added plugin loading from ux0:tai/config.txt (where ux0 is the newly mounted USB storage). If that file exists, when the plugin is loaded, it will tell taiHEN to use that file instead of ur0:tai/config.txt. Kernel plugins in ur0:tai/config.txt will always be loaded first (including usbmc.skprx of course), then once that's done, kernel plugins from ux0:tai/config.txt will be loaded. Application plugins will no longer load from ur0:tai/config.txt (it will be ignored). Instead only ux0:tai/config.txt will be considered. If this sounds confusing or you don't like it, do not create ux0:tai/config.txt.