Emergency fix for NPE on Mac OS (RPTools#765)

Updates to Change Log and Credits (RPTools#754)

* Update ChangeLog for 1.5.5 release

First pass.

* Fix ChangeLog and update credits.html

Fixed typos and missing linkage in ChangeLog.
Updated credits.html file.

Issue RPTools#735

* Add missing issue 670

Updated with issue 670.

* Update ChangeLog and Credits

Updated Change Log for issues 731, 746 & 751.  Updated MapTool credits  with recent contributor and missing `</td>` tags.

Merge pull request RPTools#752 from JamzTheMan/develop

Fix for jpeg2000 image extraction for PDF's

Update build.gradle to pull dicelib v1.5.5 (RPTools#749)

build.gradle updated to pull in dicelib v1.5.5
Completes issue RPTools#746.

More updates to ChangeLog plus updated credits. (RPTools#737)

* Update ChangeLog for 1.5.5 release

First pass.

* Fix ChangeLog and update credits.html

Fixed typos and missing linkage in ChangeLog.
Updated credits.html file.

Issue RPTools#735

Resolve RPTools#694 -- Fix asset panel scaling (RPTools#695)

Add DebounceExecutor, update ZoneRenderer.java to use debounced repai…

…nt (RPTools#611)

dispatcher.

Merge pull request RPTools#666 from JamzTheMan/develop

Add new Server Option for GM to Reveal FoW for Unowned Tokens.  Add option plus hosting status to output of getInfo("server").

Updated for issue RPTools#617

Last issue added for release 1.5.4.

Merge pull request RPTools#608 from Phergus/issue343cce

Added trap to catch wrong object type passing through