Previously, the child process could be deleted from its own
handleConnectionLost() callback, which would attempt to stop the child
process's thread from that same thread.

Now, the demo will attempt to stop the coordinator thread from the main
thread instead.

Some Windows 11 devices have both touch screens and mouse inputs, and
these can be used simultaneously.

The Viewport (and ListBox) now check the input source of each mouse
down. If the source is not a mouse, the viewport will always enter
drag-to-scroll mode, regardless of the result of isScrollOnDragEnabled.

This commit removes the various compiler-specific JUCE_DEPRECATED macros and replaces them with C++14's deprecated attribute. It also removes the JUCE_CATCH_DEPRECATED_CODE_MISUSE flag as we can rely on the override specifier catching usage of these old virtual methods, and tidies up the DOXYGEN preprocessor checks as they were inconsistent across the codebase.

Without the BOM, VS assumes UTF-8 strings (subproject file names etc.)
are ansi-encoded.