Draft: GTK4 BETA

First changes for the migration to GTK4

Migrated GSpellTextView

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$ meson build --prefix=/usr
$ ninja compile -C build
[ Become root if necessary ]
$ ninja install -C build

Run /usr/bin/gspell-app1 for a demo application

TO-DO

• Migrate testsuite
• Migrate GspellCheckerDialog
• Migrate GspellLanguageChooserDialog
• Migrate GSpellEntry ?