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Combobox Pattern and Examples: Convert to support draft ARIA 1.2 specification (pull #1255)

To resolve #1250 and resolve #1244:
1. Revise the combobox pattern to remove the ARIA 1.0 and ARIA 1.1 guidance and replace with ARIA 1.2 guidance. Keeps a note about ARIA 1.0.
2. In examples, remove ARIA 1.0 and ARIA 1.1 pattern subdirectories and examples.
3. Convert the 3 ARIA 1.0 listbox popup examples into a 1.2 example.
4. Convert the ARIA 1.1 grid popup example into a 1.2 example.
5. Revise regression tests for combobox examples to test the 1.2 versions.

Author: michael-n-cooper