Added preference screen.
Set up preference for configuring scanning speed.
Set up HUD to scan at the configured speed.
Fixed word prediction scanning problem for few than two choices.
Merge pull request #138 from ericwan78/issue-137

Fixed word prediction scanning problem for few than two choices.
Merge pull request #134 from ericwan78/issue-94

Added IME scanning speed preference . Fixes #94
Don't show HUD after keboard if HUD disabled via long click.
Created a new class for single-switch touch interface.
Redirected touch switch to the single-switch touch interface class.
Merge pull request #141 from sagarchandarana123/issue-140

Don't show HUD after keboard, if HUD disabled via long click. Fixes #140
Connected touch interface to scanning switch.
Add FIXME messages for merge #141
Merge pull request #143 from jorgesilva/develop

Add FIXME messages for merge #141
Merge pull request #144 from ericwan78/issue-142

Connected keyboard scanning to touch interface. Fixes #142
Add all scaled graphical assets for Tecla Next HUD
Done.
Merge pull request #148 from sagarchandarana123/issue-147

Renamed vars and methods to 'Long_Clicked' rather than 'Hide'.
Now swapping HUD icons properly. Fixes #145
Merge pull request #149 from jorgesilva/develop

Swap HUD icons properly. Fixes #145
Added a step to allow switching from IME to HUD overlay.