Adding Hanuman, Nokora and Suwannaphum fonts for Khmer

Not making it default for now, to allow more testing by the community.
Other KhmerOS fonts are removed as per community request.

See: https://bugzilla.wikimedia.org/show_bug.cgi?id=53673#c9

Bug: 53673
Change-Id: I4e01dd19d1e8a4e10b6ba150ea912c6f352e6cbe
Merge "Adding Hanuman, Nokora and Suwannaphum fonts for Khmer"