Reintegrates changes from cf9fc84669

- Created a new detail namespace
- Moved shared module implementation details into the detail namespace
- Split dependencies so source files only rely on details in the detail namespace
- Removed all code from the juce_gui_basics.cpp file

JUCE no longer depends on built artifacts of the AAX_SDK

This reverts commit 4deea8ed93.

Prior to 26a23dfc the Android project exporter requested the Bluetooth
permission by default, and some PIPs depended on this behaviour.

abspath doesn't cope very well with paths that contain spaces, even if
those spaces are escaped.