ci: name android release assets by version

ci: update tim2tox mobile backtrace fix

ci: update tim2tox android build fix

ci: update tim2tox mobile build fixes

ci: fix mobile tim2tox build dependencies

ci: fix mobile tim2tox cross-build paths

ci: build mobile tim2tox artifacts in release jobs

ci: install flutter manually on arm runners

ci: package desktop releases by arch

ci: keep one installer per platform in releases