Updated CRT library, test process, EventLoopGroup API updates (#16)

* Updated to latest aws-crt-ffi, updated EventLoopGroup/options init

* Removed test-ci target, just use test for everything now

* Added event_loop_group API to CRT/stubs

* Removed headers (all generated) from format-check

* Added the ability to force extension vs FFI

* make test will now trigger composer run test/phpunit, and force tests with both FFI and extension

* Updated builder version, removed redundant php7 test run

* Removed type annotations that anger php5, limited backends on php5

format-check.sh

@@ -10,7 +10,7 @@ if NOT type $CLANG_FORMAT 2> /dev/null ; then
 fi
 
 FAIL=0
-SOURCE_FILES=`find src ext -type f \( -name '*.h' -o -name '*.c' \)`
+SOURCE_FILES=`find src ext -type f \( -name '*.c' \)`
 for i in $SOURCE_FILES
 do
     $CLANG_FORMAT -output-replacements-xml $i | grep -c "<replacement " > /dev/null