Bug 20894: Add barcode size parameters to /svc/barcode

Bug 20894: Add barcode size parameters to /svc/barcode

This patch adds a couple of new parameters to the barcode generator
service: "modulesize," which controls the size of QRcodes*, and
"height," which can be applied to all other barcode types.

* The "modulesize" number refers to the pixel dimensions of each black
and white square in the generated QRcode. The dimensions in "squares" of
the QR code depends on how much data is being encoded.

For QRcodes, one default parameters is used: An error-correction level
of "M" (Medium, https://en.wikipedia.org/wiki/QR_code#Error_correction).

To test, apply the patch and restart services. Test various settings to
confirm that barcodes are displayed correctly:

http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=QRcode&modulesize=3&barcode=https%3A%2F%2Fkoha-community.org
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=QRcode&modulesize=6&barcode=https%3A%2F%2Fkoha-community.org
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=Code39&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=Code39&height=20&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=COOP2of5&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=IATA2of5&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=Industrial2of5&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=ITF&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=Matrix2of5&height=50&barcode=32000000203734
http://127.0.0.1:8081/cgi-bin/koha/svc/barcode?type=NW7&height=50&barcode=32000000203734

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>