Bug fixes for ESMF_Config

[danrosen25]

Fixes esmf-support 184 Fixes esmf-support 155 Fixes esmf 192

• Fix issue with inserting characters to config buffer
• Fix issue replacing attributes that start with quotations
• Removes line limits from ESMF Config
• Remove this_line from ESMF_Config
• Add next_item index marker to iterate over lists
• Add eolflag marker to iterate over lists
• Set value to first non colon after find label to support labels with and without colon
• Fix blank values
• Replace ESMF_ConfigSetIntI4 internals with ESMF_ConfigSetString for less maintenance
• Increase value size limit in multiple subroutines to NBUF_MAX

[danrosen25]

@oehmke to kick off all ESMF tests on derecho for branch bugfix/esmf_config

[billsacks]

Thanks for inviting me to review this. I don't feel a need to review it, but can do so if you feel it would be worthwhile. Let me know your feelings.