Platforms renamed to have clear naming, Mega2560-5500 platform added, flashing tools for mac attached, compiled images renewed

check_custom_build_flags_mega2560-5500.sh

@@ -0,0 +1,9 @@
+#! /bin/bash
+CUSTOM_BUILD_FLAGS_FILE="custom-build-flags/build_flags_mega2560.sh"
+export FLAGS="$FLAGS -DPIO_SRC_REV="$(git log --pretty=format:%h_%ad -1 --date=short)
+export FLAGS="$FLAGS -DWiz5500"
+#TODO: make one file for all envs
+if [ -f $CUSTOM_BUILD_FLAGS_FILE ]; then
+    source $CUSTOM_BUILD_FLAGS_FILE
+fi
+ echo $FLAGS