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-config

@@ -0,0 +1,65 @@
+#!/bin/sh
+
+# Get the canonical path of the folder containing this script
+bindir=`cd -P -- "\`dirname -- "$0"\`" && printf '%s\n' "\`pwd -P\`"`
+
+# Calculate the canonical path of the prefix, relative to the folder of this script
+prefix=`cd -P -- "$bindir/../" && printf '%s\n' "\`pwd -P\`"`
+exec_prefix=${prefix}
+exec_prefix_set=no
+libdir=${exec_prefix}/lib64
+
+#usage="\
+#Usage: $0 [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs]"
+usage="\
+Usage: $0 [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs] [--static-libs]"
+
+if test $# -eq 0; then
+      echo "${usage}" 1>&2
+      exit 1
+fi
+
+while test $# -gt 0; do
+  case "$1" in
+  -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
+  *) optarg= ;;
+  esac
+
+  case $1 in
+    --prefix=*)
+      prefix=$optarg
+      if test $exec_prefix_set = no ; then
+        exec_prefix=$optarg
+      fi
+      ;;
+    --prefix)
+      echo $prefix
+      ;;
+    --exec-prefix=*)
+      exec_prefix=$optarg
+      exec_prefix_set=yes
+      ;;
+    --exec-prefix)
+      echo $exec_prefix
+      ;;
+    --version)
+      echo 2.33.0
+      ;;
+    --cflags)
+      echo -I${prefix}/include/SDL2  -D_REENTRANT
+      ;;
+#    --libs)
+#      echo -L${exec_prefix}/lib64   -lSDL2 
+#      ;;
+#    --static-libs)
+    --libs|--static-libs)
+      sdl_static_libs=$(echo " -lSDL2   -pthread  -lm" | sed -E "s#-lSDL2[ $]#$libdir/libSDL2.a #g")
+      echo -L${exec_prefix}/lib64 $sdl_static_libs
+      ;;
+    *)
+      echo "${usage}" 1>&2
+      exit 1
+      ;;
+  esac
+  shift
+done