Analyze the rc modes activation conditions and only process configured entries. Previously the entire possible list was processed even though typically only a handful are configured.
Reduces the RX task processing time by about 25% (~44us to ~33us) with an average setup of 3 modes configured (F405, SBUS). Processing time savings will diminish as the user configures more modes. But typically far fewer than the maximum of 20 will be configured.
Having the iterm resetting happening in the rx loop causes a sawtooth PID/motor effect while idling since the PID loop is running at a much higher rate and iterm is allowed to grow during this, and then only reset at a much lower rate in the rx loop. This can potentially lead to some oscillation and/or resonance while idling before takeoff as the sawtooth signal can make it through to the motor outputs.
Adds a new exit/save menu that can be displayed at any time using the yaw-right stick command. Yaw-left still functions as "back".
Allows the user to save their settings even while nested deep in multiple menus. Previously the user was required to back up all the way to the top level menu to save or exit.
The logic did not support the switched 3D modes and would always set the throttle to `mid_rc`. This is appropriate for normal 3D mode, but for switched 3D modes this would lead to 50% throttle (either positive or negative depending on the switched mode settings).
Adds support to persist the RTC (if set) across the reboot if entering mass storage mode for on-board flash. The value is then used as the timestamp for the files exposed in the virtual FAT32 filesystem. The files will then have reasonable creation dates when copied to the host computer.
If the RTC is not set (or supported), then the default timestamp of 2018-01-01 will be used (unchanged from previous).
Included some improvements to the RTC functions and exposed the `tz_offsetMinutes` in the `timeConfig` PG. Support already existed for timezone offsets but the parameter wasn't exposed to the user and couldn't be set.
Move timezone offset up a layer as a parameter to systemResetToMsc()
Adds support for specifying a custom timezone offset from both the CLI and MSP calls to enter mass storage mode.
Added an option timezone offset minutes to the CLI `msc` command. If no parameter is specified then the default as specified by `timezone_offset_minutes` will be used. So to reboot into mass storage mode and force the file timestamps to be in UTC, use `msc 0`.
Added reboot message `MSP_REBOOT_MSC_UTC` to support rebooting into mass storage mode and forcing the timestamps to use UTC time (0 offset). The Configurator will need to be modified to use this message for operating systems that expect UTC times for FAT file systems (like Linux).
