typing changes for public api integer to/get/require calls
api testcase fixes related to int typing changes
add duk_to_uint(), some improvements to other integer coercion calls (duk_to_uint32() etc)
api doc updates
trivial test case fixes related to int coercion return type changes
release note update
api doc for duk_require_uint()
Merge branch 'api-int-typing'
ditz issue update