Update to allow table formatting rules

Allow formatting rules to be defined in plugins.

$TableFormat hashtableto be defined with key as data column, and value as an array of formatting rules. Rules are a hashtable with the expression, and value as formatting rules.

Formatting rules are a CSV of what to format (i.e. Row or Cell), pipe-separated html attribute and value (e.g. class|critical, style|background-color: #FFDDDD").

See sample reports for examples.
Sample plugin for table formatting
Sample plugin for table formatting
Merge pull request #91 from Sneddo/table-formatting

Table formatting