Fixes & memory optimizations (#540)

- Disable BlueTooth driver by default, to ensure it doesn't allocate memory
- Update BlueTooth settings app behaviour to make sure it starts/stops the devices
- Disable SPI RAM usage for ST7789 as it broke App Hub
- Reduce T-Display and T-Deck display buffers from 1/3rd to 1/10th of resolution
- Enabled dynamic buffers for MbedTLS to optimize memory
- TLS 1.3 did not work with dynamic buffers: downgrade to 1.2 for now
- WiFi is now enabled from the Boot app callback to the WiFi service, instead of the WiFi service start() function. This avoids a lockup when WiFi is started by the service while the Boot app is updating the WiFi settings.

build-tests/Libraries/SDL/sdl2.pc

@@ -0,0 +1,14 @@
+# sdl pkg-config source file
+
+prefix=/usr/local
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib64
+includedir=${prefix}/include
+
+Name: sdl2
+Description: Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.
+Version: 2.33.0
+Requires.private: 
+Conflicts:
+Libs: -L${libdir}   -lSDL2    -pthread  -lm
+Cflags: -I${includedir} -I${includedir}/SDL2  -D_REENTRANT