Brandon Haynes

A la Postgres

There's no reason we need to expose Ffmpeg, GPAC, etc. in our headers. Move them to source files.

E.g., ``` `_ZNSt17_Function_handlerIFN7lightdb16shared_referenceINS0_7runtime7RuntimeIJEEENS0_12DefaultMixinEEEvEZNS2_L4makeINS0_8physical9CPUDecode7RuntimeESA_JEvEEDaRT0_DpOT1_EUlvE_E9_M_invokeERKSt9_Any_data' referenced in section `.rodata.cst8' of CMakeFiles/lightdb_test.dir/src/planning/VisitorTests.cc.o: defined in discarded section `.text._ZNSt17_Function_handlerIFN7lightdb16shared_referenceINS0_7runtime7RuntimeIJEEENS0_12DefaultMixinEEEvEZNS2_L4makeINS0_8physical9CPUDecode7RuntimeESA_JEvEEDaRT0_DpOT1_EUlvE_E9_M_invokeERKSt9_Any_data[_ZN7lightdb12optimization14ChooseDecoders5visitERKNS_7logical17ScannedLightFieldE]' of CMakeFiles/lightdb_test.dir/src/planning/VisitorTests.cc.o ```

Might as well clone the repository there instead of in the plugin directory

This doesn't exist, right?

Might as well allow users to pick out a version, if they know it. Should we also expose version information in the metadata?

Or at least do something sane...

Allow users to define an implicit interpolator, which is used when a TLF needs to be resampled. The QO can use the II (if present) when necessary to improve query...

Also confirm that scanned TLFs exist in the catalog