Backports from main
Some improvements that will make maintenance easier:
* build: Bump minimum meson verison to 0.56.2
It's in Debian oldstable even
(cherry picked from commit c14219e1e73cf00d1412532ee0b4e3e85666e6fc)
* build: Drop quotes around boolean value
Deprecated in meson 1.1.0
(cherry picked from commit 13b8273cc40722a87f817357a996309a28e01f03)
* build: Drop gui_app
Not useful on Linux and deprecated in meson 0.56.0:
https://mesonbuild.com/Reference-manual_functions.html#both_libraries_gui_app
(cherry picked from commit fd6acd5188a6503066d855dbab0f101f3b2a857e)
* tests: Make it simple to run with ASAN
(cherry picked from commit f990dc567b5628be70cc7c8031497f6707a546c0)
* gitignore: Ignore generated po files
(cherry picked from commit 1022ba8de282b28ddb0a8aa2709d3eab05bb8fdd)
* dir-locals: Avoid tabs in meson files
(cherry picked from commit e7052f39d40247d2ce7f7031cc75d4c49fb8c7d1)