Rename Keyboard IME

[Linfye]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

I renamed the code variable names and XML file names according to this rule.

• SimpleKeyboardIME -> GeneralKeyboardIME
• MyKeyboardView -> KeyboardView
• MyKeyboard -> KeyboardBase

After my initial testing, the app can run normally currently.

Related issue

• Rename keyboard IME and view #223

[github-actions]

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Maintainer checklist

• The linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[andrewtavis]

Thanks so much for picking this up and the the initiative in deciding what to rename things, @Linfye! Really great to be taking this step as a project away from the original codebase 😊

Let us know if one of the new issues is appealing for you to pick up!