This is a clean up to remove conditional compilation for all Qt versions
older than the last known to work: Qt 5.9 with Qt WebEngine and Qt Charts.
Includes an update note to INSTALL documents.
Introducing a directory structure to make it a bit less
daunting for new developers and perhaps even old hands.
The main folders all start with an upper character, so src
files are now located in;
* Core - Core data structures
* Gui - Main GUI elements
* Metrics - Models and Metrics
* FileIO - Device and File I/O
* Charts - All the chart types
* Cloud - Working with Web Resources
* Train - Anything Train View specific
* ANT - Our ANT+ Stack
* Resources - Images, Translations, Web etc
Apologies to anyone who needs to merge across this update.