"software" slide covering the information about the wide range of
software packaged in Hamara Sugam was missing in the installer. Add the
software slide. Increase the timer interval to 15s to make the content
apprehensible to the user.

Side-effects: None
Tested: OK

Calamares uses the settings as per /etc/calamares/settings.conf with the
installer. These settings consist of all the important modules that are
to be loaded from the launch of the installer till the end. The order in
which these modules should be loaded is also important.

Fix the ordering of the modules as per they'll be needed in the
installation process following Debian's settings procedure. Add the
missing modules because of which the installation with EFI system
partitions fails (introduced in commit 08d5ee8d).

Add missing mount-media-chroot module to calamares-modules to complete
the desired installation procedure.

Side-effects: None known so far
Tested: OK

The path has been changed by live-build upstream a few months ago as stated here,
https://salsa.debian.org/live-team/live-build/blob/master/debian/NEWS
This was causing the installation to fail for the built ISO's

Tested: through manual fixing, not through the package. But it will work fine.

This resolves bug 414 https://bugs.hamaralinux.org/show_bug.cgi?id=414

- added the welcomeStyle option in branding, explicitly

setting the security repo from buster to testing. So we don't have to keep changing them every time for newer releases

- The Calamares Installer now follows the Hamara style guide for the
colours on the sidebar

only till we get new backgrounds.