Runtime: Fix bugs in Linux target.
- next occurence absolute time computation failing on 32-bit because of casting
- PLC thread was started before period was set, potentially passing uninitialized timespec to clock_nanosleep()
#Encoding of BACnet Object Types;;;
#Code;Object Type;;
0;Analog Input;;
1;Analog Output;;
2;Analog Value;;
3;Binary Input ;;
4;Binary Output;;
5;Binary Value;;
6;Calendar;;
7;Command;;
8;Device;;
9;Event-Enrollment;;
10;File;;
11;Group;;
12;Loop;;
13;Multistate Input;;
14;Multistate Output
15;Notification Class
16;Program
17;Schedule
18;Averaging
19;Multistate Value
20;Trend Log
21;Life Safety Point
22;Life Safety Zone
23;Accumulator
24;Pulse Converter