UI: Refine layout of the UI elements

Prevent automatic screen rotation

UI Refinements, layout more space savvy.

Ability to shorten standard leader tone to 15 seconds.

Prepare for 1.0.0 release

Localization to Czech and Polish.

Styles modified to tolerate "Dark mode"

Enhanced to prevent sleep while playing back tape image

State of the UI controls is remembered across executions.

Refactoring

- System requirements lowered to Android 4.4
- Cosmetic coding changes, typo fixes

Bugfixes:

- The switch controls had no effect
- The Amplitude label didn"t get disabled during playback

Enhancements:
- New control for sample rate

UI:
- Padding of widgets synchronized

Refactoring:
- Signal generation related classes moved to their own package