[Tile-serving] [openstreetmap/osm2pgsql] Refactor functions calling back into Lua code (#1204)

[Jochen Topf]

The flex output calls several user-defined Lua functions. They are
"prepared" by putting the function pointers on the Lua stack and later
called. This change gets rid of magic numbers and uses more generic
names for the functions doing the preparing and calling.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1204

-- Commit Summary --

  * Refactor functions calling back into Lua code

-- File Changes --

    M src/output-flex.cpp (83)
    M src/output-flex.hpp (47)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1204.patch
https://github.com/openstreetmap/osm2pgsql/pull/1204.diff

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