TI Cores v1.3.1

Create new MSP430 platform core msp430gcc9 version 3.0.0 (fixes #9)

• Updates MSP430 compiler to GCC 9.3.1.11
  • GCC 9.3.1.11 is the last version released by Texas Instruments, and much more up-to-date than version 4.6.6 included with MSP430 core version 1.1.0
  • C++11 and C++14 are supported by default
    • C++17 and C++20 are supported, but need to be explicitly enabled using the appropriate -std command line option
    • See https://gcc.gnu.org/projects/cxx-status.html
  • Code compiled with this compiler version will probably use more RAM and flash than code compiled using GCC 4.6.6
    • Other potential compatibility issues listed here

Update mspdebug tool to version 0.25 on MacOS (for both msp430 v1.1.0 and msp430gcc9 v3.0.0)

• mspdebug is used for uploading to MSP430 non-ET boards
  • Compiled from the GitHub source repo
• Version 0.25 has been tested to work with MacOS 15 Sequoia
  • Windows and Linux continue to use version 0.24

Full Changelog: v1.2.0...v1.3.1