EXT-7497 FIXED Made Build, Search, Map, Mini-Map and Sidebar buttons in...

EXT-7497 FIXED Made Build, Search, Map, Mini-Map and Sidebar buttons in bottomtray hidden by default.

Also declaration of all settings related to bottom bar buttons and custom chatbar width were moved from code to settings.xml
 to prevent issues with resetting of these settings between restarts.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/452/

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branch : product-engine