40 terminal bitmap generation

[tomseli]

Added the possibility to load images and generate bitmaps at desired sizes

To load an image:

1. Click Open under File in the menubar
2. Navigate to the folder with the images
3. Change Scripts (*.txt) to Images (*.png, *.jpeg)
4. Select the desired imaged and click OK
5. Select a desired size under the dropdown menu*, the image will be scaled to have this size as its maximum length
6. Click Convert
7. The bitmap will be saved to ./out/[original filename].h

*Hints are not supported for combo boxes (dropdown menus)