Refactor component structure

[TillFleisch]

This PR changes the location at which sub-components are located and refactors the switch and number components to be in line with ESPHomes standards.
The platform names used in configuration files have changed from matrix_display to hub75_matrix_display.

Breaking Change

The platform name has been changed from matrix_display to hub75_matrix_display.
Components must be changed from matrix_display,matrix_display_switch,matrix_display_brightness to hub75_matrix_display.
Furthermore, the explicit definition of platformio_options:lib_deps must not be declared in the yaml configuration.
The newly added use_custom_library option can be used to revert to the old import style.

Old

New

esphome: name: matrix-display friendly_name: Matrix Display platformio_options: lib_deps: - SPI - Wire - Adafruit BusIO - adafruit/Adafruit GFX Library - https://github[...]ing display: - platform: matrix_display id: matrix width: 64 height: 32 switch: - platform: matrix_display_switch matrix_id: matrix name: "Power" number: - platform: matrix_display_brightness matrix_id: matrix name: "Brightness"

esphome: name: matrix-display friendly_name: Matrix Display display: - platform: hub75_matrix_display id: matrix width: 64 height: 32 switch: - platform: hub75_matrix_display matrix_id: matrix name: "Power" number: - platform: hub75_matrix_display matrix_id: matrix name: "Brightness"