Spoqa Han Sans: A custom font based on Noto Sans and Lato

This is Spoqa Han Sans, which supports both Korean and Japanese but prioritizes
Korean Hanja above the other.

"Spoqa Han Sans is a custom font based on Noto Sans and Lato to fit
multilingual UI of Spoqa's products. We now unveil the new version which has
evolved in many ways."

• Spoqa

WWW: https://github.com/spoqa/spoqa-han-sans

PR: 232197
Submitted by: Hyun Hwang
Approved by: (one of the mentors)

• poudriere (11.2-, 12.0-RELEASE, 13.0-CURRENT@r345355 amd64 + i386) -> OK (with options ORIGINAL/SUBSET on/off each)
• portlint -> OK
• Runtime tests by using deskutils/gucharmap -> OK

Minor fixes from the original patch:

• Sorted variables a bit according to the PHB
• Simplified the installation by using option helpers to use custom variable SRCFONTSDIR