Merge branch '19-improve-ci-cd-remove-update-step-disable-build-debug-in-master-branch' into 'master'

Resolve "Improve CI/CD, remove "update" step, disable "build-debug" in master branch"

Closes #19

See merge request !18

Resolve "Avoid print calls in production code"

Closes #18

See merge request !17

Resolve "Remove deprecation in flutter gradle plugin"

Closes #17

See merge request !16

Resolve "Use flutter linter and apply lints"

Closes #16

See merge request !15

Resolve "Add delay on computer turn"

Closes #14

See merge request !14

Resolve "Upgrade framework, build tools and dependencies"

Closes #15

See merge request !13

Resolve "Remove iOS variant"

Closes #12

See merge request !12

Resolve "Upgrade flutter framework and dependencies"

Closes #13

See merge request !11

Resolve "Enable splash screen"

Closes #11

See merge request !10

Resolve "Improve app metadata, include fdroid metadata in repository"

Closes #7

See merge request !9

Resolve "Upgrade Flutter framework and dependencies"

Closes #8

See merge request !7

Resolve "Clean code"

Closes #9

See merge request !8

Resolve "Fix icon color"

Closes #6

See merge request !6

Resolve "Upgrade flutter framework and dependencies"

Closes #5

See merge request !5

Resolve "Add GPLv3 license"

Closes #4

See merge request !4

Resolve "Add a restart game button"

Closes #3

See merge request !3

Resolve "Add minimal gameplay"

Closes #2

See merge request !2

Resolve "Add minimal empty application"

Closes #1

See merge request !1