Boa Release of PiTubeDirect

• Features:
  • #14 Added a minimal cmdline.txt to the release package
  • #32 Improved boot message for native ARM Co Pro
  • Accurate speed throttling for 6502 core and improved interface for speed control
  • Various small speedup changes including specifically for Pi 3
  • 32016 Emulation code synced up with B-Em version (mostly cosmetic)
  • Misc code tidyups
• Fixes:
  • Tube ULA (for all CPUs):
    • #20 fix for Domesday/SCSI systems
    • #21 fix Type 2/3 transfers for network file systems
  • 80x86 core:
    • #31 fix booting with Control-Break
    • #39 fix SIN/COS/TAN in BBC Basic
    • #40 fix LIST in BBC Basic
    • #42 fixes to PUSH, DAA, DAS, 0B opcodes
    • Other misc improvements
  • ARM2 core (ARM Evaluation System)
    • #23 fix Debug application crashes
  • Native ARM (something like a GHz version of ARM Eval System)
    • #24 fix to detect code headers in executables
    • #25 fix to star command processing
    • #26 fix to cache consistency
    • #36 fix BAS135 inability to SAVE
    • Fixes to OS_GetEnv() (Pull request #45 from JGH)
    • Pi 3 only: #27 fix BAS135 crash
  • 6809 core:
    • #34 6809: fix Escape handling in Basic
  • Nat Semi 32016 core:
    • #17 fix rounding error printing floating point numbers
    • #18 fix Escape handling in Basic
    • Pi 3 only: #16 CLOCKSP diagnostics
    • Pi 3 only: #28 Fix BAS32F misalignment abort
  • Misc improvements to Z80 emulation