[chirp_devel] New driver for Radtel RT-490 and clones (fix #9665) (patch)

Hello, Please find the patch for a new driver for Radtel RT-490 and its clones (8 at this moment). Driver supports: - Radtel RT-490, - MMLradio 8629, - JJCC 8629, - Socotran JC8629, - Socotran FB8629, - Jianpai 8629, - Boristone 8RS, - Abbree AR869, - HamGeek HG590. Support ALL official software features. Plus these new features: - FM preset - Channel memory preset - Killswitch setup (+ can revive killed radios) - Bands settings for 4 bands ranges + tx on/off - Fixed issue of radio being corrupted with official software   with custom (channel/ani) names - Included basic help for custom features - Disable radio identification string verification   (good to recover from a bad state)

Regards,Ao9.

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