enhance development environment (#1841)

* add sdkconfig.defaults per environment 

https://github.com/platformio/platform-espressif32/issues/638

* add env to platformio

* add sdkconfig.<pioenv>.defaults

* Update platformio.ini

* Update .gitignore

* Delete sdkconfig.esp32cam-cpu-freq-240.defaults

* Delete sdkconfig.esp32cam-dev-himem.defaults

* Delete sdkconfig.esp32cam-dev.defaults

* Delete sdkconfig.esp32cam-no-softap.defaults

* Add files via upload

* Update sdkconfig.esp32cam-cpu-freq-240.defaults

* Update platformio.ini

* Update platformio.ini

* Update CMakeLists.txt

* Update sdkconfig.esp32cam-dev.defaults

* Update platformio.ini

code/sdkconfig.esp32cam-dev.defaults

@@ -0,0 +1,36 @@
+### nothing actually
+
+
+/* #disabled
+
+#### recommended optimizations to test 
+#https://docs.espressif.com/projects/esp-at/en/latest/esp32/Compile_and_Develop/How_to_optimize_throughput.html
+
+# System
+CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE=4096
+CONFIG_FREERTOS_UNICORE=n
+CONFIG_FREERTOS_HZ=1000
+#CONFIG_ESP32_DEFAULT_CPU_FREQ_240=y
+#CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ=240
+#CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
+#CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
+
+# LWIP
+CONFIG_LWIP_TCP_SND_BUF_DEFAULT=65534
+CONFIG_LWIP_TCP_WND_DEFAULT=65534
+CONFIG_LWIP_TCP_RECVMBOX_SIZE=12
+CONFIG_LWIP_UDP_RECVMBOX_SIZE=12
+CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=64
+
+# Wi-Fi
+#CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=16
+#CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=64
+#CONFIG_ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM=64
+#CONFIG_ESP32_WIFI_TX_BA_WIN=32
+#CONFIG_ESP32_WIFI_RX_BA_WIN=32
+#CONFIG_ESP32_WIFI_AMPDU_TX_ENABLED=y
+#CONFIG_ESP32_WIFI_AMPDU_RX_ENABLED=y
+
+## end of recommended optimizations
+
+*/