Various fixes (#444)

- Add missing symbols for TactilitySDK
- Disable display idle logic when there's no LVGL display

TactilityC/Source/symbols/string.cpp

@@ -0,0 +1,14 @@
+#include <private/elf_symbol.h>
+#include <symbols/string.h>
+
+#include <string>
+
+extern "C" void _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE15_M_replace_coldEPcjPKcjj(void*, char*, unsigned int, char const*, unsigned int, unsigned int);
+
+const esp_elfsym string_symbols[] = {
+    // Note: You have to use the mangled names here
+    { "_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE15_M_replace_coldEPcjPKcjj", (void*)&_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE15_M_replace_coldEPcjPKcjj},
+    // { "", (void*)&(std::) },
+    // delimiter
+    ESP_ELFSYM_END
+};