Simplify XML layout. Breaks associated class DO NOT MERGE

Started refactoring xhdpi resources. Changes need to be propagated to the other resource files
Continue HUD layout experiments. DO NOT MERGE
Latest attempt to make a layout work
Merge branch 'develop' of https://github.com/idrc/tecla-framework into issue-73
Update README.md
Add highlighter screenshot to docs
Merge branch 'develop' of https://github.com/idrc/tecla-framework into issue-73
Draw HUD button bounds. DO NOT MERGE

Commented out view import statements to prevent errors on HUDController class
Turned rect into path. DO NOT MERGE

Now drawing corner button
All corners drawn, scaled and rotated. DO NOT MERGE

Missing side views
Draw entire HUD. DO NOT MERGE

Does not rescale on orientation change.
Corner button padding needs fixing.
Requires normal/highlighted state setter.
Requires alpha animation/setter.
Removing unused bitmaps
Merge pull request #78 from jorgesilva/issue-73

Draw HUD programmatically. Fixes #73
Disabled scanning and HUD single-switch activation.
Added try catch block for unregistering mReceiver.
Merge pull request #82 from ericwan78/issue-81

Disabled scanning and HUD single-switch activation.
Merge pull request #83 from ericwan78/issue-70

Added try catch block for unregistering mReceiver.
Merge branch 'develop' of https://github.com/idrc/tecla-framework into develop
Merge pull request #84 from jorgesilva/develop

Catching up to develop branch
Revert "Merge pull request #83 from ericwan78/issue-70"

This reverts commit 96c4fe4f1bcc78d01b8f3cea9712d5efac6d0deb, reversing
changes made to 284247324c6681d0253a856e0d4e655896673ce3.