[maven-release-plugin] prepare release 3.1.9
[maven-release-plugin] prepare for next development iteration
** Renamed CharacterSheet entity property content -> contents
** Added DAO and controller classes for CharacterSheets
** Updated dustjs into latests version
** Fixed character sheet material viewer name in MaterialController
** Fixed MaterialController material data getter
** Added new baseUrl dustjs helper
** Added styles for links in header descriptions
** Added dust template for rendering character sheets in client side
** Removed DATAURL alert from illusion-character-sheet.js so the script
could be used for previewing purposes also
** Changed ChracterSheet to update urlname if title is changed
** Added view for editing / viewing Character Sheets
** Fixed integration test sql scripts to work with changes in database