- added gradle build file for the 'UsbSerialLibrary' android library.
- updated gradle build file for the 'Android' project to include dependency for the 'UsbSerialLibrary' project.
- removed MapManager, and MissionItemDetailManager.
completed base implementation of MissionRender.
- added a mission render singleton for the whole application.
- finalized drone instance fields.
completed integration of the new Android mission, and mission items structure.
started to add back missing functionality.
Added the gradle build file to the UsbSerialLibrary project.
- bug fixes.
- addition of detail fragments for several mission item types.
- addition of marker source for several mission item types.
fix draw tool display issues.
restored mission path drawing and moved it to the MissionRender class.
updated package for the MissionRender class.