Replace deprecated method in SyntaxHelper.

Closes #58.
Add experimental one-pane mode for tablets.

Addresses #60.
Add non-static mode checking methods.
Improve one-pane mode for tablets.

Closes #60.
Add properly alphabetized lexicon database.

This commit adds a new, properly alphabetized version of the lexicon database
created using GRDBC 1.2.0. This fixes #62.
Remove deprecated Mode methods.
Fix a bug affecting lexicon favorites ordering.
Update manifest and readme for v1.2.0 release.
Add lexicon favorites database upgrade code.