Fixes #1875 and #1849: implemented LCD initialization for low temperatures. Initialization skipped in case of watchdog reset or boot-loader exit.
Re #1875 and #1849: the delay for Taranis Plus reduced to 300ms
Merge pull request #1877 from opentx/projectkk2glider/issue1875_lcd_low_temp

Fixes #1875 and #1849: implemented LCD initialization for low temperatures