added resources manager
removed leftover data member
injected new class IdTableBase between QAbstractItemModel and IdTable
Minor change to improve generated STL code (only tested with MSVC 2012).  More details in forum post https://forum.openmw.org/viewtopic.php?f=6&t=2153#p24065
added Feature_Constant to IdTable
resolved UniversalId naming ambiguity
make modification column optional in table views
added resources tables
added subviews for resources tables
filter resources files based on extension
enable dragging from resources tables
some refactoring (removing redundant code)
fixed exceptions
added separate display type for colours
more refactoring
drop part of resources drag and drop
Merge branch 'resources'
removed a left-over marker