esp32: Fixes several issues in core dump feature

1) PS is fixed up to allow GDB backtrace to work properly
2) MR!341 discussion: in core dump module: esp_panicPutXXX was replaced by ets_printf.
3) MR!341 discussion: core dump flash magic number was changed.
4) MR!341 discussion: SPI flash access API was redesigned to allow flexible critical section management.
5) test app for core dump feature was added
6) fixed base64 file reading issues on Windows platform
7) now raw bin core file is deleted upon core loader failure by epscoredump.py

components/esp32/cpu_start.c

@@ -203,6 +203,8 @@ void start_cpu0_default(void)
 #endif
     esp_ipc_init();
     spi_flash_init();
+    /* init default OS-aware flash access critical section */
+    spi_flash_guard_set(&g_flash_guard_default_ops);
 
 #if CONFIG_ESP32_PHY_AUTO_INIT
     nvs_flash_init();