Added Dastgir's item_*.txt -> item_db.conf converter

- To be used in a follow-up commit.

Signed-off-by: Haru <haru@dotalux.com>
Extended ItemDB to support several other formats (part 1)

- Updated item_db.conf in preparation for the source edits.

Signed-off-by: Haru <haru@dotalux.com>
Extended ItemDB to support several other formats (part 2)

- Actual source edits

Signed-off-by: Haru <haru@dotalux.com>
Removed some files which are no longer used
Updated db2sql converter to match the recent item db changes

Signed-off-by: Haru <haru@dotalux.com>
Merge pull request #283 from dastgir/itemdb_remake

Extended item_db.conf to have several other formats.