chore(build): Refactor / cleanup platformio environments

[Slider0007]

Refactor platformio build environments

• ESP32CAM -> default environment
  • Make software options MQTT, INFLUXDB and SOFTAP enabled by default (in code editor not greyed out anymore -> easier to maintain code)
  • These options still can be controlled using the build flags ENV_DISABLE_MQTT, ENV_DISABLE_INFLUXDB and ENV_DISABLE_SOFTAP. Defining the flag option will be excluded from compilation.
• esp32cam-localbuild
  • equal to esp32cam. Can be used to locally build firmware inlcuding parameter tooltips
• esp32cam-task-analysis
  • More debug related functions are enabled than in default environment. Only needed for task analysis or heap leakage tracing
• esp32cam-debug
  • More debug related functions are enabled than in default environment. Only needed for deep code analysis
• esp32cam-himem
  • Activates HIMEM area of SPIRAM (upper 4MB). Only showcase. Firmware is not supporting HIMEM up to now.