TEXTAaChange case and variable naming

Change case and variable naming

Two kinds of text normalisation in one page.

Upper section · case / trim: UPPERCASE, lowercase, Title Case, collapse runs of whitespace into one space, and remove blank lines — handy for cleaning up text copied from elsewhere.

Lower section · variable naming: camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE and dot.case all at once — for renaming fields across languages/stores (Java field → Python variable → DB column).

Note: naming conversion follows Latin-letter rules; with Chinese or other non-Latin input only the Latin parts are affected, so check the result before using it.