Fix missing log steps at 0.1s period (#1967)

fixed issued where log steps would be missed due to 10ms timer resolution
- simulator: allow for one get_tmr10ms() tick (10ms) deviation
- radio: switched to FreeRTOS software timer at user requested period

code cleanup
log.cpp: made variable lastLogTime static
log.cpp: deleted unused variable g_logError
functions.cpp, logs.cpp, sdcard.h: renamed variable logDelay to logDelay100ms to show it is scaled to 100ms increments

radio/src/functions.cpp

@@ -350,7 +350,7 @@ void evalFunctions(const CustomFunctionData * functions, CustomFunctionsContext
           case FUNC_LOGS:
             if (CFN_PARAM(cfn)) {
               newActiveFunctions |= (1u << FUNCTION_LOGS);
-              logDelay = CFN_PARAM(cfn);
+              logDelay100ms = CFN_PARAM(cfn);                   // logging period is 0..25.5s in 100ms increments
             }
             break;
 #endif