ProffieOS 6.4
Same as 6.3, but the following bugfixes:
- subblade errors now says "error in blade array" instead of crashing again
- Fixed a rare type inference bug in TrConcat
- ignite_time fix for fett264 prop
- fix for DISABLE_COLOR_CHANGE in fett263 prop
- Improved comment at top of ProffieOS.ino
- Serial monitor welcome message now includes ProffieOS version.