Drop-analysis

This is the first release candidate for the first full release. Changes since v0.3.0:

* Save both x and y coordinates of the detected contact points
* Measure the center of mass of the drop (based on the projection on the camera)
* Give a popup when trying to close with unsaved data
* Added usage documentation
* Fix pandas append deprecation (fixes 13)
* Added about and help dialogs

This release also attaches a compiled windows installer and a compiled portable windows version.

This release adds the option to fit drops with an ellipse in addition to a polyfit. This can be more precise for symmetric droplets.

First beta release.
* Attached is a windows installer
* The program can now be installed from pypi, using pip. (`pip install drop-analysis`)

This is supposed to be the last alpha release.
The plan is to create install.py and get better requirement management, so the program is easier to install and release the first beta version after that.

Changes:
* Added settings screen
* Allow choice between linear subpixel interpolation and errorfunction subpixel interpolation
* Allow changing openCV framesize and framerate
* Allow changing default pixel height for polyfit
* Allow changing polyfit oder
* Added option to allow other fit methods
* Added option to record live video
* Allow changing the location of the buffer file
* Added option to export video
* Changed data export to default to csv, with xlsx as second option.

First release with compiled binaries. Note that the binaries need `Mainwindow.ui` to be in the same folder
Added jpeg mimetype
Moved framesource objects to separate file

Added support for single images and tiff stacks.
Added more visual feedback of what is happening.
Allow to manually change the amount of pixels to use to fit up from the contact line.

v0.0.1alpha-hotfix