runtime: changes to block headers to allow pure virtual sub-classes (interfaces)
Fixing missing include files and various other patches for Windows build issues.
Merge remote branch 'jblum/wip/attributes' into next
Merge remote branch 'jblum/mergeme/misc/gruel_thread_simplification' into next
Merge remote branch 'jblum/mergeme/misc/gr_flowgraph_include_iterator' into next
Merge remote branch 'jblum/mergeme/misc/use_boost_math_round' into next
Merge remote branch 'jblum/mergeme/misc/use_boost_math_trunc' into next
created gruel/attributes.h to house compiler specific attribute macros
replaced instances of attribute with __GR_ATTR from attributes.h
what else has compiler specific attributes?volk - volk is stand-alone, needs its own attributes.hgcell - not touching that, probably gcc only anyways...
Merge remote branch 'jblum/wip/gr-audio' into wip/gr-audio
Added/updated ignore files.
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