The installer assumes that the CWD of the running PHP process is setup/,
which isn't necessarily true (if run from a cli module, for instance).

Change the config table from a column-based table to a key-value table
with namespacing. This allows several parts of osTicket to store their
respective configurations in the same table without requiring database
structure updates

'namespace' is reserved in PHP

The installer compares the md5 of the on-disk sql install file with the
signature file shipped alongside. If the signatures do not match, it will
refuse to install osTicket. On Windows(TM) platforms, PHP will automatically
translate newlines to Windows newlines (CRLF), which will corrupt the MD5
hash of the file.

This patch opens the file in binary mode explicitly to prevent the automatic
conversion.

The problem stems from assumed MySQL insert ids. In MySQL clusters, the id
numbers will not necessarily be consecutive. This patch causes the install
and upgrade patches to lookup the assumed values for the linked id numbers.

Make collation consistent - utf8_general_ci.