tidy up
add some images
add android files
add Card from Aztter and update qmls to use dp unit
small change
add TitleBarButton
some changes

use TitleBarButton, add storage variable in main.qml, and fix titleBar
not shown issue, add "add task" button to AddTaskPage, fix layout in
AddTaskPage, fix addTask in Storage.js, add comment in Storage.js, fix
Page
remove tag and add folder

task is associated to tags, but I want to associate task to a folder, so
rename tag to folder. recrating database is needed.
add func to Storage

add readTasksByFolder
fix AddTaskPage

fix GroupBox, rateSlider, statusBar message
fix icon size in TitleBarButton
fix MainListPage issue
add TaskPage

add TaskPage, rename id to taskId, add openTask signal to MainListPage,
add Utils.js
add PieChart
implement ShintyokuPie and add to TaskItem