James Zern 40b3a618ec examples: warn on invalid numeric parameters
add ExUtilGet[U]Int / ExUtilGetFloat which print an error message on
parse failure.
fixes issue #219.

(cherry picked from commit 96d43a873a61886e0642ec50f25cadccc21a5086)

Conflicts:
	examples/cwebp.c
	examples/dwebp.c

Change-Id: Ie537f5aebd138925bf1a48289b6b5e261b3af2ca
2014-10-14 12:02:16 +02:00
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