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Use existing HTTP client on Telegram initialisation

Fix logging deprecation output

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Update README and CHANGELOG

InputMedia methods fixed

API 4.3 - Seamless Telegram Login

Prevent system commands from being called by the user directly

Use PSR-3 LoggerInterface to allow custom logging implementations.

Smarten up subEntities and return empty array for Entity items

Housekeeping git meta and tests, custom issue templates

Smaller code and docblock fixes

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Update funding and donation/support infos.

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