Implement the Google Data Tables with the DBTs and the BLCs having a common ancestor

[s5bug]

• DBT tables
  • https://www.microsoft.com/typography/otspec/cbdt.htm
  • https://www.microsoft.com/typography/otspec/ebdt.htm
• BLC tables
  • https://www.microsoft.com/typography/otspec/cblc.htm
  • https://www.microsoft.com/typography/otspec/eblc.htm

These are basically the same tables with different image formats, look at OTFNAMETable to see that you do not need to implement every single possible combination.

[s5bug]

So far CBDT has been implemented.