David Woodhouse 38167c268f Add get_config_version_hash() and make hash functions constexpr
Add Application::get_config_version_hash() as a constexpr that returns
fnv1a_hash_extend(config_hash, ESPHOME_VERSION).

Make get_config_hash(), get_build_time(), fnv1a_hash(), and
fnv1a_hash_extend() constexpr inline functions.

Replace open-coded fnv1a_hash_extend(config_hash, ESPHOME_VERSION)
calls with get_config_version_hash() in sensor and wifi components.

Remove now-unnecessary version.h includes from component files.
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Description
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
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