Refactor application initialization

app/app.go

app/cpuprofile.go

app/fix_home.go

app/runtime_platform.go

app/warn_on_bool.go

cmd/gitlab-runner-helper/main.go

cmd/gitlab-runner/main.go

helpers/cli/cpuprofile.go

helpers/cli/fix_home.go

helpers/cli/runtime_platform.go

log/configuration.go

log/configuration_test.go