Simplified configuration for ir-full, tasmota-ircustom no more needed

[s-hadinger]

Description:

Simplified configuration for IR. Now IR-full is done directly with ifdefs and does not need CLI options:

• removed tasmota-ircustom which is no more needed
• packaged IRremoteESP8266 in a subdirectory to avoid changing library.json when updating library version

WARNING: Platform.io fails to detect changes in ifdefs, so if you change any IR configuration, you need to clear the .cache directory.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.1.0.7
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[arendst]

So with this addition to the default library we need to make sure it is appended with any library update.

[s-hadinger]

That's why I pushed the entire library one directory below. You shouldn't change this file, and only update teh content of the subdirectory also named IRremoteESP8266