Initial Tests & CI (#5)

* Added awscrt_version() and test for it

* Added builder.json for CI

* Added github actions

* Added format-check.sh

* Force php5.6 on ubuntu

* Updated submodules

format-check.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+if [[ -z $CLANG_FORMAT ]] ; then
+    CLANG_FORMAT=clang-format
+fi
+
+if NOT type $CLANG_FORMAT 2> /dev/null ; then
+    echo "No appropriate clang-format found."
+    exit 1
+fi
+
+FAIL=0
+SOURCE_FILES=`find src -type f \( -name '*.h' -o -name '*.c' \)`
+for i in $SOURCE_FILES
+do
+    $CLANG_FORMAT -output-replacements-xml $i | grep -c "<replacement " > /dev/null
+    if [ $? -ne 1 ]
+    then
+        echo "$i failed clang-format check."
+        FAIL=1
+    fi
+done
+
+exit $FAIL