added ctrl+z for paste

ported to adw about dialog

fixe appdata

Merge remote branch 'origin/master'

Conflicts:
    data/io.github.nokse22.minitext.appdata.xml.in

window controls

Update io.github.nokse22.minitext.appdata.xml.in

added actions to increase/decrease font size

Merge pull request #2 from gianni-rosato/master

optimized assets

Update io.github.nokse22.minitext.appdata.xml.in

update screenshots