SVGHMI: add "unsubscribable" property to widgets in order to generalize what already happens for jump buttons.
In most cases jump buttons do not really subscribe to pointed HMI variable, path is given as a relative page jump path. When widget.unsubscribable is set to true, no subscription is made on page switch, but still offset is updated.
This fixes bug happening on relative jump buttons without "disabled" element where offset did not change on relative page switch.

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#Encoding of BACnet Object Types;;;

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#Code;Object Type;;

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0;Analog Input;;

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1;Analog Output;;

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2;Analog Value;;

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3;Binary Input ;;

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4;Binary Output;;

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5;Binary Value;;

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6;Calendar;;

    10

7;Command;;

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8;Device;;

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9;Event-Enrollment;;

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10;File;;

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11;Group;;

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12;Loop;;

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13;Multistate Input;;

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14;Multistate Output

    18

15;Notification Class

    19

16;Program

    20

17;Schedule

    21

18;Averaging

    22

19;Multistate Value

    23

20;Trend Log

    24

21;Life Safety Point

    25

22;Life Safety Zone

    26

23;Accumulator

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24;Pulse Converter