ARM: TxSoftSerial:: software serial port integration (Tx only)

    ARM: TxSoftSerial:: software serial port integration (Tx only)
    - be careful charging functionality not tested
    - decrease ADC_IRQ priority 0 => 1
    - resolve LCD coruption when compile with -O3 optimization
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I spent more time on Git then on program :(
I open one branch for testing based from your last version, fetch it locally and then merge with my last changes, and finally rebase last 5 commits to one.