Added full-screen settings in prerference xml file.
Added full-screen options in SettingsActivity.
Corrected class name for supported IME check.
Loaded full-screen settings on TeclaAccessibilityService from preferences.
Added a check for HUD on accessibility event.
Merge branch 'develop' of https://github.com/idrc/tecla-framework into issue-200
Merge pull request #206 from jorgesilva/develop

Fixes minor onboarding issues
Modified preference screen init.
Merge pull request #205 from ericwan78/issue-200

fixes #200
Update HUD icons & simplify full-screen switch mode settings