~kolletzki/attachment-dl

Fix download of inline attachments with filename
Add menu and about window

Signed-off-by: Lukas Kolletzki <mail@lukaskolletzki.com>
Add LICENSE

Signed-off-by: Lukas Kolletzki <mail@lukaskolletzki.com>
Remove build manifest
Fix build manifest dependencies
Add dev dependencies to build manifest
Update to fyne 1.3.0
Enhance charset handling of non-utf8 messages
Add xorg-server-devel build dependency
Fix CI manifest
Fix CI manifest
Add Makefile and CI config
Refactor application and settings
Initial commit