Ignore build dirs
Make plot xBottom to be fixed from midnight 7 days ago to next midnight.

Ticks are also set to be fixed, with major ticks occur at each midnight.
Fixes #1
Disable plot panner and zoomer
Implement tracking cursor
Compatibility to MSVC and Qt 5
Tweak widgeMouseMoveEvent and label text format
Update databases.json format
Modify databases.json format
Add v0.2 changelog