Misleep

Fixed some bugs, including load anno with multi states.

Spindle detection is available now. For the first version.

Add new feature. SWA detection in the tool menu bar. May not so stable, and I suggest to only detect SWA in the NREM state, which you can select in the dialog, or it will take a lot of time to run the detection. Also you can check the notebook in [script](https://github.com/bian-lab/scripts/blob/master/signal_process/activities_detection/swa_detection.ipynb) for a step-by-step code.

1. 1 row or 1 column data are all avaliable, and hybrid format (some data is 1 row and others are 1 column format) is also support.
2. Start-end label got shortcut, from num1 to num9 stand for the label list's first item to ninth item.

Fixed some bugs. Added 3 new features.
1. Now we are using menu instead of ToolBar, since the tools are becoming more.
2. No `Show` button anymore, once you load a data, it will check and show automatically. So now `Load annotation` is optional, if you don't load, you can also view the data and do annotation and other analysis. But once you want to save any annotation, you need to set a file for that.
3. **Add horizontal line** is now avaliable. In the `Tools` menu. You need to select a channel to plot the horizontal line, and after you set the value or you select a relative value, which 'Standard deviation' and 'Mean' is now avaliable, you can also choose a color for the line. Finally you need to click '+' button and then add a line to the channel plot.

There are two usful shortcut, 'shift+d' for load data, 'shift+a' for load annotation.

EDF data format is now availiable
Bio-signal sleep annotation format is now availiable