Implement quasar-core package

[cnouguier]

• Implement and test the core components:
  • KAvatar.vue
  • KDialog.vue
  • KFollower.vue
  • KPanel.vue
  • KStamp.vue
  • KTextArea.vue
  • KChip.vue
  • KEditor.vue
  • KLogo.vue
  • KScrollArea.vue
  • KStore.vue
  • KTree.vue
  • KContent.vue
  • KExpandable.vue
  • KModal.vue
  • KSponsor.vue
  • KTab.vue
  • KVersion.vue
• Implement and test the action components:
  • KAction.vue
  • KBugReportAction.vue
  • KToggleFullscreenAction.vue