ExpressLRS V1.0.0 RC6 Release

Another week, another RC. Thanks to everyone who gave feedback and reported issues, changes as follows:

• Fix hang in telemetry sender if TX disconnects while RX is expecting ack of last packet
• Fix telemetry stopping after first send if only one telemetry type is ever sent by FC
• Fix incorrect datarate PPM frequency correction for Team900
• Fix Ghost TX losing serial configuration after autobaud cycle
• Fix NO_SYNC_ON_ARM still syncing on arm
• Fix TX not returning to proper rate after bind
• Prevent running packet rates higher than 250Hz on 115200 baud serial
• Add SugarK slim / slimmer STLs
• Add DISABLE_STARTUP_BEEP to user_defines.txt
• Fix RX_SCOREBOARD displaying two missed packets if packet prior to telemetry was missed