Persist MissisonItemStatus visibility

Warn about Above Terrain usage

Add setting to show Presets tab first

Expose guided altitude settings. Rearrange Fly and Plan view settings.

Limit all queries to areas smaller than 500km^2. If an area of interest is greater, clip to 500km^2 centered on current ROI's center.
Removed the identifier "Airmap" from error messages coming from Airmap.
Added a clipping function to QGCGeoBoundingCube (clip polygon to given area)

Make the choice of using a personal key persistent. This will allow to toggle between personal and hardcoded key. Otherwise you would need to clear your personal key each time you want to use the hardcoded one.

The build system will look for src/Airmap/Airmap_api_key.h
If it find is, it will used the provided API key and client ID for Airmap.
That file should provide two strings:
static const char* kAirmapAPIKey = "key data";
static const char* kAirmapClientID = "id data";

Local builds, without these will have no Airmap support by default (users can always enter their own within the Airmap settings panel).

All settings wired and persistent
Cleanup non Airmap builds

Move all airmap related stuff to its own directory

Added AirMap settings (SettingsGroup)
Added AirMap settings block to General Settings
Create macros to deal with the tedious repetitions within SettingsGroup
Removed old, hacked in setting for AirMapKey
Remove a few of the tons of build warnings

Also hand carried text to speech changes from Stable to master. Plus
unit tests for that.

Too complicated supporting both modes as editor becomes more complex

- You can now cancel parameter change
- Tablete friendly