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Set CXXFLAGS and CFLAGS environment variables for whatever it's worth.

The generate_row.py script is no longer needed but this is officially
the last version of it with all last local modifications.

Adding new script to build ffmpeg and dependencies. Apparently I spent a
good while working on this locally but never committed it.

Adding update from github: https://github.com/packjpg/packJPG/commit/93a7dfbe1fb9aa2aee763cc5b8a16c14b2f66c8c

Minor updates mainly to pwmgr to fix Gtk3.0 deprecations.

Update generate rows script for repayment schedule.

Adding automated watering system scripts.

Update display.py with latest root fs device path.

Thanks to hbkcd, the interface portion can now just be some javascript
(and CSS and HTML).

Add link time optimization to compiler (linker) flags.