[Tile-serving] [osm2pgsql-dev/osm2pgsql] Make sure identifiers are in line with policy (Issue #2361)

[Jochen Topf]

joto created an issue (osm2pgsql-dev/osm2pgsql#2361)

Identifiers for classes, functions, classes etc. should [follow our coding styles](https://github.com/osm2pgsql-dev/osm2pgsql/blob/master/CONTRIBUTING.md#code-style). Most use lower case with underscore, classes have postfix `_t` etc.

clang-tidy can check this. See https://clang.llvm.org/extra/clang-tidy/checks/readability/identifier-naming.html .

Here is a first, incomplete try at a config snippet which can be added to `.clang-tidy`:
```
    - key: readability-identifier-naming.ClassCase
      value: lower_case
    - key: readability-identifier-naming.ClassSuffix
      value: _t
    - key: readability-identifier-naming.PrivateMemberPrefix
      value: m_
    - key: readability-identifier-naming.StructCase
      value: lower_case
    - key: readability-identifier-naming.EnumCase
      value: lower_case
    - key: readability-identifier-naming.FunctionCase
      value: lower_case
    - key: readability-identifier-naming.FunctionIgnoredRegexp
      value: luaX.*
    - key: readability-identifier-naming.VariableCase
      value: lower_case
    - key: readability-identifier-naming.GlobalConstantCase
      value: UPPER_CASE
    - key: readability-identifier-naming.NamespaceCase
      value: lower_case
```


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