Upgrade Vue.js to v3 and drop IE11 support

[mvorisek]

Major version upgrades:

css-loader                        ^5.2.6  →    ^6.7.1
mitt                              ^2.1.0  →    ^3.0.0
style-loader                      ^2.0.0  →    ^3.3.1
vue                              ^2.6.14  →   ^3.2.41
vue-flatpickr-component           ^8.1.7  →   ^10.0.0
vue-loader                       ^15.9.7  →   ^17.0.0
vue-template-compiler            ^2.7.13  →   removed
vue-flatpickr-component           ^8.1.7  →   ^10.0.0
semantic-ui-vue                  ^0.11.0  →   removed
vue-fomantic-ui                    added  →   ^0.13.0
vue-flatpickr-component           ^8.1.7  →   ^10.0.0
vue-query-builder                 ^0.8.2  →   github:TheAustinG/vue-query-builder#2f5c4408e3

• css-loader, style-loader
  no change required
• mitt
  no change required
• vue, vue-loader
  https://blog.logrocket.com/refactoring-vue-2-apps-vue-3/
  --> BC break: you must update your components to vue3
• vue-template-compiler
  https://github.com/vuejs/core/tree/main/packages/compiler-sfc
  no change required (integrated into vue package as of 3.2.13)
• semantic-ui-vue/vue-fomantic-ui
  Plugin is not working with Vue 3 Semantic-UI-Vue/Semantic-UI-Vue#489
  --> BC break: replaced with https://github.com/nightswinger/vue-fomantic-ui
• vue-flatpickr-component
  https://github.com/ankurk91/vue-flatpickr-component/blob/master/UPGRADING.md
  no user change required
• vue-query-builder
  replaced with dabernathy89/vue-query-builder@master...TheAustinG:vue-query-builder:master fork
  no user change required

multiline/vue dropdown API filtering to be fixed later - #1940

BC break: we also drop IE11 support officially (as no longer supported by vue3 - https://stackoverflow.com/questions/64836337/using-vue-3-in-ie11#64837153)

[mvorisek]

Hi @ibelar, would you be please so kind and look at the vue3 upgrade?

[ibelar]

Hi @ibelar, would you be please so kind and look at the vue3 upgrade?

Upgrading to Vue 3 will not be possible until Semantic-Ui vue is upgrade as well or completely refactoring component that use it.

[mvorisek]

@ibelar I have managed to upgrade Vue to v3, but I have to admit it was not easy - how much do your apps use custom vue? Would you be ok to have this PR in the next major stable atk4/ui release, or should we release v4.0 first and then tag 4.1 for easier migration?

[mkrecek234]

@mvorisek Great, thank you! Even though I am not using a lot of Vue components (only very few) I see that a lot of Vue libraries out there are still in the process of being migrated to v3 - I personally would opt for the 4.1 release for Vue v3 to make upgrade paths more flexible. Too many great improvements beyond Vue v3 so far in Atk4 to bundle them in one release.