[bugfix] wrong handling for imperal
[bugfix] fix missing handling between metres and imperal
[refactoring] conversion for positioning
[bugfix] fix degree character
[bugfix] read all int and float preferences as string
fix #31: [bugfix] every second times the cartridge list is shown
vice-versa
[bugfix] eliminate null pointer exception
fix #33: fix map center
fix #34: platform id is set proper
fix #35: use default theme
fix #32: show progress dialog for single click / start