Add ui_init() & ui_start_tuner()

Add Utilities from STM32F429I-Discovery_FW_V1.0.1(only needed)

ui_init
    init LCD and init LAYER
    set default layer & color
    start tuner ui
ui_start_tuner
    clear buffer
    draw a character
    draw frequency
modified sleep time to avoid blinking
Merge branch 'UI' of https://github.com/rtenv-plus-stm32f4/rtenv-plus-stm32f4
Fix the conflict file path